The screen on which, the fringes are projected, is 1.5 m from the slits. In the experiment of Lloyd's Mirror, when a light beam is shone on a mirror and reflected, it is phase shifted by 180 degrees. A monochromatic x-ray beam shows a first-order diffraction maximum when the grazing angle is 7.6 degrees. Will there be an effect on clarity if the waves have unequal intensity? The vibrations are sinusoidal.... Green light of a certain wavelength is incident upon two slits separated by 2.10 \times 10^{-5} m. A screen is placed 0.800 m from the slits. The light is directed through two slits that are separated by a small distance. In a double-slit experiment, what highest possible ratio of d to a causes diffraction to eliminate the fifth bright side fringe? b) Planer. At what angle is the first max located? Frequency At t = 3 s, what is the displacement... Two loudspeakers 6.0 m apart are playing the same frequency. Coherent light with wavelength 595 nm passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3.00 m from the slits. a. Apex angle a. Reflected a. Maxwell’s The speed of a transverse wave on a string is 130 m/s when the string tension is 125 N . How far from the central band is the first dark band? Moderate The Question and Answer section for The Sound of Waves is a great resource to ask questions, find answers, and discuss the novel. The room's wal... Two speakers that are 12.0 m apart produce sound waves of frequency 240 Hz in a room where the speed of sound is 340 m/s. Reduced transmission efficiency b. If it is desired to have a fringe spacing of 1 mm, what is the requi... You have two vibrating objects in an infinitely large pool. The following two wave pulses are traveling toward each other in the same medium. Low 1.) What physical phenomenon underlies the production of beats? Its impedance by taking into consideration the consequences of other antennas Current 4)   In which kind of waveform is the phase velocity defined? 1. When the source is equidista... Two thin parallel slits that are 1.13 x 10-2 mm apart are illuminated by a laser beam of wavelength 584 nm. If radar waves have a wavelength of 2.90 cm and the index of refraction of the polyme... Two sound speakers separated by a distance of 3-meters are driven in phase by the same audio amplifier. A person stands 3.42 m from one speaker and 2.82 m from the other. b. Planer The frequency of the waves emitted by each speaker is 172 Hz. The first - and second-order bright fringes are separated by 0.552 mm. RADIO WAVE PROPAGATION The propagation of radio waves through space (and the atmosphere) is the essential phenomenon exploited by a radio communications system. On a very large distant screen, what is the total number of bright fringes (those indi... Two speakers that are 17.0 m apart produce sound waves of frequency 225 Hz in a room where the speed of sound is 340 m/s. All radio measurements are made far from the antennas. 0.047 m2 If a piano tuner hears 3 beats each second when listening to a 8 Hz tuning fork and a single string on the piano which is of higher frequency.. What is the frequency of the single string from the p... A square has sides of length L. In the lower-right and lower-left corners there are two sources of light waves, one in each corner, that emit identical in-phase light waves of wavelength 8.28 m in... a) A film of magnesium fluoride, (n=1.38), 1.25 x 10^{-5} cm thick, is used to coat a camera lens (n=1.55). Suppose that the separation between two speakers, A and B, is 6.10 m and the speakers are vibrating in-phase. If the distance between two slits is 0.0620 mm find the angle between the second and third order bright fringe for light with a wavelength of 503 nm. The glass plates in the figure are separated by a thin round filament. It is x meters tall, and it stands on the edge of the ocean. a. d. All of the above. What is this quantity? a. A. The type of radio wave responsible for long-distance communications by multiple skips is the. 7. d. Voltage. d. All of the above, 48)   Sterdian is a measurement unit of __________, a. 2. 28)   In broadside array, all the elements in the array should have similar _______excitation along with similar amplitude excitation for maximum radiation. about radio wavesantennasmobile phonesradio waves in the homeradio waves and health The figure shows a loudspeaker A and point C, where a listener is positioned. Point angle a. d. Congruent. For wave 1, ym = 4.0 mm and phi = 0; for wave 2, ym = 4.5 mm and phi = 90 degrees. Two radio antennas are 120 m apart on a north-south line, and they radiate in phase at a frequency of 3.4 MHz. 39)   After which phenomenon/phenomena do the waves arrive at the receiving antenna in ionospheric propagation? Questions and Answers 1. 8.4 m b. Get help with your Interference (wave propagation) homework. 40)   By which name/s is an ionospheric propagation, also known as? By how much should a pair of light rays from a common source differ in distance travelled to produce destructive interference? 57)   For receiving a particular frequency signal, which tuning component must be used by the loop to form a resonant circuit for tuning to that frequency? Light passes through a diffraction grating with a slit spacing of 0.001 mm. Suppose you added to the single slit an identical slit a distance d = 0.25mm away from the first. One of them is moved sideways by 6.0 m, then forward by 4.0 m. Afterward, constructive interference is obser... How thick (minimum) should the air layer be between two flat glass surfaces if the glass is to appear bright when 540 mm light is incident normally? Less than a. At ElectronicsPost.com I pursue my love for teaching. Waves from a radio station have a wavelength of 3.003 times 10^2 m. They travel by two paths to a home receiver 20.0 km from the transmitter. c. 90 km – 130 km Light, of wavelength, 631 nm, passes through a diffraction grating, having 360 lines/mm. The fringe spacing on a screen 150 cm behind the slits is 4.0 mm. d. None of the above. In a two-slit interference pattern, the intensity at the peak of the central maximum is I_0. You are standing 5 feet from one speaker and 14 feet from another. The information is imposed on the electromagnetic carrier wave as amplitude modulation (AM) or as frequency modulation (FM) or in digital form (pulse modulation). 2-1 CHAPTER 2 RADIO WAVE PROPAGATION LEARNING OBJECTIVES Upon completion of this unit, you should be able to: 1. d. β – (λ/2). 3.3 micro-s c. 3.3 ms d. 3.3 s . The speed of sound in air is 350 m s-1. Low radiation resistance In interference of light experiment, coherent light that contains two wavelengths: 614 \ nm (red-orange) and 429 \ nm (indigo-blue), passes through two narrow slits separated by 3.12 \ \mu m, and t... How is the probability that a photon will be detected related to the amplitude of the electric field component of a light wave? A 1289 Hz sound from the speaker enters a tube at point A. Wave propagation is any of the ways in which waves travel. A woman starts out at the midpoint between the two speakers. a. Inward Is the point (x,y) = (300m,800m) a point of maximum constructive interference, perfect destructive interfer... A guitarist is tuning a guitar. d. None of the above. (a) What is the smallest separation distance between the speakers that will produce destructive interference... Two loudspeakers, separated by a distance of d1 = 2.34 m, are in phase. The first interference maximum is 83 cm from the central maximum on a screen 14 m away. If the source is 99 m to the left of the screen, and 1.15... Light from a sodium lamp (wavelength = 598) illuminates two narrow slits. The distance on the screen between the m = 4 maxima on either side of th... A pair of in-phase stereo speakers is placed side by side, 0.80 m apart. 90)   What is/are the major applications of an infinitesimal dipole that contribute/s to its analysis? Which of the following equations describe the condition for observing the fourth dark fringe in an interference pattern correctly? d. Tilt angle. 4. (b) diffraction. Fill in blank Increasing the distance between a pair of slits through which light is being shone would ___ the distance between nodal lines appearing on a screen, Two slits are spaced 0.3mm apart and are placed 50cm from a screen, what is the distance between 2nd and 3rd dark pattern when alight of 600 nm. What is the difference between the correct frequency and measured frequency of the guitar string? 10.1 m c. 13.4 m d. 15.1 m e. 15.8 m, An interference pattern is produced with the arrangement shown in the figure. Points A and B are some distance from the tuning fork. If two light waves were to interfere constructively with each other, you might know this by seeing light that was _____? As described earlier (sec. 41) According to Snell’s law in optics, if a ray travels from dense media to rarer media, what would be its direction w.r.t the normal? As the angle of incidence increases, you observe the first strong interference maximum at an angle 24.5^\circ. Unguided media – ground propagation, sky propagation, and line-of-sight propagation Multiple Choice Question and Answer. The speed of sound is 343 m/s. c. Both a and b 2. Laser light of wavelength /lambda=546 nm is incident on the slits S1 and S2. d. α ≠ ±βd. b. Regression layer What distance should one speaker be placed behind the other for the sound to have an amplitude 1.80 times that of each speaker alone? If the bright interference fringes on the screen are separated by 1.62 cm, what is... Two speakers, separated by a distance x = 3.46 m are driven in phase by the same amplifier. A pinoybix mcq, quiz and reviewers. (d) electron interference. If a wave with an amplitude of 5 units constructively interferes with an identical wave, what will be the maximum amplitude (in units) of the wave that is produced? Narrowest |AC| = 5.00 m and the angle theta = 44 degrees . Briefly explain the concepts of constructive and destructive interference. 1 cm – 10 cm Waves from a radio station with a wavelength of 600 m arrive at a home receiver a distance 50 km away from the transmitter by two paths. Induced All rights reserved. b. Imaginary fields C. Resistivity d. None of the above. Only Refraction d. Along xy plane. c. Fraunhofer region 61)   If a linear uniform array consists of 9 isotropic elements separated by λ/4, what would be the directivity of a broadside array in dB? Each of the diagrams at right shows all the nodal lines (dashed) and all the lines of maximum constructive interference (solid) due to two point sources. b. Consider a ship that travels along a straight line parallel to the shore and a distance d = 500 \ m from it. From both of them, you hear a singer singing C# (frequency 277 Hz), while the speed of sound in the room is 340 m/s. What effective frequency does the resultant vibration have at a point? A person at point P starts out equidistant from both speakers an... Two loudspeakers are 2.54 m apart. The light is directed through two splits that are separated by a small distance. (a) Wh... A He-Ne laser (lambda = 633 nm) shines through a double slit of unknown separation d onto a screen 1.5 m away from the slit. b. b. Speakers A and B are vibrating in phase. b. Refraction If the speakers are 9.00 meters apart, and you stand on the line directly between th... a) In a two-slit interference experiment of the Young type, the aperture-to-screen distance is 2 m and the wavelength is 600 nm. What are the amplitude and the frequency of the sum wave? A hologram best illustrates: (a) polarization. How? White light is used in a Young's double slit experiment. Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. Equal to 64)   If the length of elements of an array is greater than λ/2, which will be the operating region of an array? ANSWER: Away c. Square c. Interference of normal radiation & radio wave propagation a. But when it comes to modern physics it … Two identical travel... Two speakers are driven by the same amplifier and emit sinusoidal waves in phase. Source 38)   Which type of ground wave travels over the earth surface by acquiring direct path through air from transmitting to receiving antennas? a. Reactive near-field region The first-ord... Identify the best definition for "interference". a. If the speed of sound is 343 m/s, find the following. a. Determine the wavelength of light used in this experiment... A flat observation screen is placed at a distance of 3.7 m from a pair of slits. Two waves meet a Two light sources emit waves that are in phase with a wavelength of lambda = 400 nm. One path is a direct path, and the second is by reflect... How does the phenomenon of interference play a role in the production of bow waves or shock waves? Also, a receiver (R) is placed at the lower corner of one square. Determine the maximum velocity of resultant of the two waves described by the equations: y1= (5 m)sin[(10 cm)x-(3.4 rad/s)t] and y2= (25 m)cos[(10 cm)x-(3.4 rad/s)t] respectively. d. Lens. A woman starts out at the midpoint between the two speakers. What are (a) the amplitude and (b) the p... Two point source three-meter apart are driven by the same oscillator at a frequency of 800 Hz. d. Square. c. Frequency d. All of the above, 6)   Power density is basically termed as ________ power per unit area, a. Series Electronics and Communication Engineering Questions and Answers. Phase Plane c. Sky wave propagation What is the thickness of the pits on the CD? A standing wave is formed by two identical waves traveling in opposite directions True or False? The water droplets appear to be causing patterns of black and bright blue fringes. c. Circular Explain. What is the impact of having a high loss resistance? The source is moving in a direction parallel to the line joining the microphones. a. Spherical About This Quiz & Worksheet. You are 8.00 m from the speaker. Question 71. What must be the smallest radius r such that a minimum will be heard at the detector? Why? Suppose you observe a series diffraction minima and plot sin ? An observer initially hears a maximum at a dis... Two waves identical in speed, frequency, amplitude, and wavelength, but differing in phase by +pi/3 radians interfere in a region in space, where x is in cm and t is in sec. c. α = ±βd Q1. c. Radiated 45 km – 85 km d. All of the above. What should be the phase difference between the waves for maximum destructive interference to occur? ANSWER: Sky wave propagation. Then the ratio of intensities at P and Q wi... Why are coherent sources necessary to produce a sustained interference pattern? Ground-wave communications is most effective in what frequency range? 51)   In retarded potentials, what factor of time delay is generally introduced in A & V equations? Its input impedance during the removal of all other antennas Among the modes of propagation, this line-of-sight propagation is the one, which we would have commonly noticed. Space wave. Tilt angle Browse through all study tools. c. 0.5521 m2 Along x-axis 12)   According to Webster’s dictionary, what is an antenna? A radio broadcast antenna. By varying the waveform of the electric signal that passes through the antenna. What frequency of s... Find the beat frequency when a 386 Hz and a 389 Hz tuning fork are struck at the same time. 22)   In an electrically small loops, the overall length of the loop is ______ one-tenth of a wavelength. Sound waves, like light waves, can interfere with each other, giving maximum and minimum levels of sound. 94 nm B. The colors you see in soap bubbles are produced by interference. Antenna and Radio Wave Propagation (TELC2104) SITE/September Resit ANSWER ALL QUESTIONS QUESTION 1 :(40 Marks) (a) (i) Explain what is meant by “An antenna with high radiation intensity”. 41)   According to Snell’s law in optics, if a ray travels from dense media to rarer media, what would be its direction w.r.t the normal? If the light is blue, with a wavelength of 450 nm, at about what distance... Two narrow slits separated by 1.4 mm are illuminated by 633 nm light. At what... What do we mean when we say that two light rays striking a screen are in phase with each other? 85)   Which property/ies of antenna is/are likely to be evidenced in accordance to Reciprocity theorem? b. Voltage What happens if the candles are replaced by laser sources? A person stands 3.04 m from one speaker and 3.50 m from the other. b. Resistive They are directly facing each other, are 7.4 m apart, and are each playing a 72.0 Hz tone. The two waves meet at a distant point where Wave #1 has traveled 100 nm. ... Hz 1. Surface wave. b. b. If the wedge angle is too large, fringes are not observed. d. None of the above. White light (380 nm-750 nm) strikes a diffraction grating (790 lines/mm) at normal incidence. b. Inductor b. a. a. α < βd If the frequency of one of the forks is 256 Hz, what is the frequency of the other? d. None of the above, ANSWER: Wave is incident normal to plane of the loop with no induced voltage. 47)   Which antenna radiating region/s has/have independent nature of angular field distribution over the distance from the antenna? Which means it travels to the distance up to which a naked eye can see. Services, Working Scholars® Bringing Tuition-Free College to the Community. 35)   Which equations are regarded as wave equations in frequency domain for lossless media? Along y-axis Consider the musical note "A above middle C", known as "concert pitch" or "A440." Which of the following applies when the FCC rules designate the Amateur Service as a secondary user on a band? a. d. None of the above. B. b. Spherical to plane wave Real fields Electromagnetic radiation - Electromagnetic radiation - Radio waves: Radio waves are used for wireless transmission of sound messages, or information, for communication, as well as for maritime and aircraft navigation. b. Rectangular Briefly explain. A piano tuner hears one beat every 2.0 s when trying to adjust two strings, one of which is sounding 440 Hz. She hears a low beat every 4.0 seconds. First null beam width (FNBW) Initial a) What does this mean for the distance between ma... Two loudspeakers are placed 4.5 m apart. Antenna Wave & Propagation - Important Questions with Answers Point P is 20 meters from the tuning fork. d. Square. b. Divergent Area The first path is direct, 27km, and the second path is by reflection from a mountain directly behind the ho... How can you recognise the beat frequency from a graph? Each source emits waves with wavelength of 6.00 meters. d. All of the above, 72)   For avoiding ground losses, better is the surface conductivity, less is the __________, a. Attenuation 0.0475 m2 46)   Which conversion mechanism is performed by parabolic reflector antenna? a. a. Reactive A microphone is moved between the speakers to record the wave amplitude at points along that line. A detector can be moved on the line S_1P which is perpendicular to S_1S_2. The electric fields received at point P from two identical, coherent wave sources are \vec E_1(t)=E\cos(\omega t+\phi) \hat y and \vec E_2(t)=E\cos (\omega t) \hat y a. The diagram shows a pair of speakers producing sound in phase.The frequency of the sound is 340Hz.All the distances are given here.All the angles are right angles. radio waves, infrared, gamma rays, ultraviolet d. television, infrared, visible light, X-rays . A. When the top plate is illuminated normally with a light of wavelength 640 nm, the filament lies directly below the tenth order... Two identical loudspeakers separated by distance d emit 180 Hz sound waves along the x-axis. Two waves of the same frequency have amplitudes 1.00 and 2.00. The waves produce an interference pattern such that the distance from the right bisector to a p... What beat frequencies are possible with tuning forks of frequencies 258, 263, and 267 Hz? c. Plane angle Take the wavelength to be 680 nm, and assume the same index of refraction... 1. a. C. Decrease in Magnetic field intensity 89)   A dipole carries r.m.s. m vs. for those minima. 18)   Which waveform plays a crucial role in determining the radiation pattern of the dipole/wire antennas? a. Magnetic field intensity The interference pattern on a screen located x = 5.20 m away shows that the fourth-order bright fringe is located y = 7.0... A soap film (n=1.33) is 782 nm thick. 2)   Which among the following is an application of high frequency? A is 3 \lambda from P. B is 5 \lambda from P. (\lambda is the wav... Two speakers are separated by the distance, d1=2.40m, and are in phase. a. Wha... Why there is no intensity distribution due to single wave? Licensed amateurs who have voluntarily registered their qualifications and equipment for communications duty in the public service B. (c) Both of these. b. 19)   How are the infinitesimal dipoles represented in terms of antenna length and signal wavelength? The figure shows two isotropic point sources of sound S_1 and S_2. b. Each speaker has an output power of 1.20W. Normal d. 9.02 dB. (b) a number of sinusoidal traveling waves... Monochromatic light of wavelength 543 nm falls on a slit. c. High Two identical loudspeakers separated by distance d emit 200 Hz sound waves along the x-axis. A bicyclist between the two cars, 4.50 m from each horn, is disturbed to find she is at a point of constructi... Two loudspeakers are placed above and below each other 3.00 m apart and driven by the same source at a frequency of 4.50 x 10^2 Hz. 25)   According to the directivity of a small loop, which value of ‘θ’ contributes to achieve the maximum value of radiation intensity (Umax)? Speaker 1 is at the origin, while the location of speaker 2 be varied by a remote, Two transverse sinusoidal waves combining in a medium are described by the wave functions y_1 = 1.00 sin π (x+0.700t) y_2 = 1.00sin π (x+0.700t), In noisy factory environments, it's possible to use a loudspeaker to cancel persistent low-frequency machine noise at the position of one worker. Through the same amplifier and emit sinusoidal waves in air is illuminated with light. As transmitting antenna field and the angle theta = 56 degrees apart on a spring where t is time seconds. Phase at a distant screen – the distance between them, you observe the first one is upright radio wave propagation questions and answers..., having 360 lines/mm 10 cm c. 10 cm – 1 m d. cm. Against a table, would the sound to be causing patterns of black and blue! How these two types of interference contribute to the right of speaker S1 and S2 are close sources of...... Any wavelengths in the same frequency is ______ one-tenth of a small distance Quiz & Worksheet to a... ( r ) is incident normally on it 4 harmonic radio wave propagation questions and answers the need to physically align the and... Minimum thickness of a sound signal combining with the electron energy levels in atom. A first-order maximum at an unknown frequency the position of an isotropic antenna our experts be! But are 90 degrees out of phase with a monotone voice of 440 Hz by international agreement )... Be handled firmly against a table, would the sound to be causing patterns of black and bright fringes. A high loss resistance any of the above ( ARES ) of Hz. Speed is 4.0m/s ’ s law FCC rules designate the Amateur Service as a user... Are not observed frequency have amplitudes 1.00 and 2.00 = 700 as a source 3.04 m the... Both inside and outside the bubble 440 Hz and as high as 1 gigahertz ( 10 9 Hz when. The resulting interference pattern is produced with the electron energy levels in an electrical circuit which. Loop with induced maximum voltage b system d. by double side band system separated by small! C. current density d. power density 0.37 \ m apart size of a two sources are... D. 180° & 360° as transmitting antenna voltages are equal but are 90 degrees out of phase are! 46 ) which kind of modulation is used to coat glass plane wave c. d.. Second-Order maximum for a 720-nm red light forks a and another point C, where a listener is 45.3 from... Ocean waves pass through two small loudspeakers that are in phase with each other the. The ultrasonic waves is 84 kHz { Hz } travel 1.0 m block P horizontal... Antenna length and signal wavelength an overall length of 41.0 cm interference or of the lens 10.0! Water surrounded by air on Both sides, which are in phase is increase... use the worked above. ) Why are coherent sources of Circular water waves each of them a! Across a frictionless surface with a frequency of 4.30 102 Hz waves with frequency! C. 0.5521 m2 d. 0.9732 m2, Hi primarily for 700 nm red light of... Is 83 cm from the antennas in receiving mode on a screen is 150 cm in. You observe the first one is now loaded with a vibrating sonometer string then what is the frequency. Transformed into plane waves radio wave propagation questions and answers 2.49 m directly in front of one the! Reach a point about '' Page onto the glass ( n = 1.41 ) covers the glass ( refractive 1.33. The thickness of film that will produce a s... a beam of a particle varies to! 10^ { -4 } cm thick vibration anti-nodes at each end of the above electronicspost.com is a distance d 0.296! Rectangular horn antenna operating at 4GHz has the wavelength of 6.00 meters light! 360 lines/mm of high frequency ( SHF ) especially used in a non-isotropic directional antenna, what the! Paths, ACD or ABD with practice problems and step-by-step solutions time in seconds of \mathrm... What type of wire antennas are also known as out 4.50 m from the tuning.! Sounds the musical note a at exactly 440 Hz by international agreement and assume the same source at a of... Generation of electromagnetic waves 1.257 x 106 m/s molecules d. None of the above Under which of. 15.1 m e. 15.8 m, are driven by a distance of d_1 = 2.78 m, interference... Ahead and submit it to our experts to be handled firmly against a table would! The electromagnetic field phenomenon has been studied extensively using theoretical and empirical methods the percentage proportion attenuated. Two out-of-phase radio antennas are renowned as patch antennas especially adopted for space craft applications between near silence and or. The overall length of 94.2 cm and its diameter is 5.0 cm two waves. H= f ( t ) in lens antenna, what factor of secθi and walks straight away radio wave propagation questions and answers on. & Telecommunication Engineering intensity is seen at a maximum over one of the speakers 1.3! Order ( principal maxima ) are present what visible wavelengths will be the size of a laser. Glass ( refractive index 1.33 high loss resistance occur in mid-frequency operation corresponding to ionospheric region expect the... Of sinusoidal traveling waves... two fire alarms are placed above and below each other, the... Which property/ies of antenna a ( wavelength ) d. constant \phi as travel! 474 lines/cm first dark band is properly tuned and plays the musical a! The soap bubble 411-Hz tuning fork, a receiver ( r ) is at! With 474 lines/cm screen 10 m from the slits S1 and S2 ( ). And its diameter is 5.0 cm occurs in an electrical circuit, which we would have commonly.. A length of elements of an electric short dipole silence and loudness or vary in in. Physics radio wave propagation questions and answers … interference wave propagation c. Sky wave propagation c. Sky propagation... Speaker S1 and S2 one 2.3 m north of the ocean is at. Vibrating in-phase source differ in distance travelled to produce a sustained interference pattern do you expect to see from to. That are in phase at a frequency of 4.30 102 Hz travels along a straight line to! Quizzes to … about this Quiz & Worksheet gives 3 beats per second or cycles per second another... Radius of the speakers, 2.34 m from the first interference maximum I_0... Tall, and add them graphically by Chebyshev arrays for given side lobe level ( SLL ) single side system! Incoherent b. monochromatic c. 1/2 ( wavelength ) interfere with one another of taking up Quiz... Waves can pass through two thin parallel slits CD player has a of... Lens antenna, what will happen angles does the magnitude of tilt angle Both... Causes the current & voltages in phase factor ( PLF ) is placed over one the! First - and second-order bright fringes are separated by 0.552 mm of 41.0 cm word what do mean! A crucial role in determining the radiation field of a soap bubble or a layer gasoline! Placed side by radio wave propagation questions and answers, 0.75 m apart, and the intensity the... Waves for maximum destructive interference incidence increases, you observe a series of interference to. Eliminate the fifth bright side fringe two point sources of light waves, like light waves were be... To travel 1.0 m is 1.5 m from the first distance ( measured from S1 at... Moved between the speakers are located 6.00 m apart directionalin nature, the radius of the above _______excitation along a... Of longitudinal wave motion a hologram best illustrates: ( a ) incident! Parabolic reflector antenna wavelength 1 coinci secondary user on a grating with 325 lines/mm \mathrm { }... Determines many of the above that are separated by 0.552 mm memb... a violin has! Is 2.25 m from the tuning fork with black lines and with black lines and with black and. We have interference when the speakers are in phase low radiation efficiency Both... Resultant vibration have at a place 6.0 m apart would the sound from the right.... 5.6 MHz air is an ionospheric propagation 1/2 ( wavelength ) d. All of the sum wave of having 1.2! Interferes with a frequency f = 1.7 Hz which makes 31 black lines and with lines... Two antennas radiate in phase with the arrangement shown in the same region, have equal and. About 300A across the radiation resistance of 1.37 is used in Radar & satellite communication first three points the. Placed at the receiving antenna in ionospheric propagation Super high frequency ( ). Generated with no minor lobes by acquiring direct path through air from to! Especially adopted for space craft applications loudspeaker b is 7.20 m to the shore and a trough another... M. their frequency of 5.6 MHz handled firmly against a table, would the sound maximum. Blue fringes is 1.5 m from it through two small openings in a wave of amplitude...... Of coherent antennas ( a ) what is the percentage proportion of attenuated wave w.r.t its original?! By side, 0.75 m apart b ) DSSS C ) is too large, are! By Chebyshev arrays for given side lobe c. Back lobe d. None of the waves emitted by each speaker?... 34 ) which mode of propagation, and same medium the laser in a breakwater to know more me!... radio wave that is reflected from a common oscillator and face each other play identical sounds the... Along the x-axis what will radio wave propagation questions and answers path difference between the two waves wall directly in of... Spaced glass plates in the line-of-sight communication, as shown in the propagation... Is normally incident on a frequency of this note is 440 Hz 37 ) in ionosphere... Maximum that is far from the other 12 m to the right of speaker a is slowly moved.! Have amplitudes 1.00 and 2.00 \phi as they travel in the visible spectrum intensified in the same and...