Then the ratio of intensities at P and Q wi... Why are coherent sources necessary to produce a sustained interference pattern? Speakers are in phase and both are emitting a sound of 60\ \mathrm{Hz}. 68)   Which kind of polarization is provided by helical antennas? The screen on which, the fringes are projected, is 1.5 m from the slits. a. a. 67)   Why are beverage antennas not used as transmitting antenna? Assume... An Array of coherent antennas (A) is configured at the corners of squares, every 10 meters from the next. What type of graph would you expect get? At which distance L, will the sound be at a maximum? a. 1)   What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication? If the amplitude of each wave is 4 mm and the phase difference between the w... Is it necessary to have two waves of equal intensity to study interference pattern? Two audio speakers are kept some distance apart and are driven by the same amplifier system. 19)   How are the infinitesimal dipoles represented in terms of antenna length and signal wavelength? A person stands 3.42 m from one speaker and 2.82 m from the other. Radio frequency is identified as number of waves per second or cycles per second. Explain how these two types of interference contribute to the periodic variation in the loudness of sound know as "beats". c. Resistive What frequency of s... Find the beat frequency when a 386 Hz and a 389 Hz tuning fork are struck at the same time. What is the resultant amplitude? 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. 3. b. α > βd Sea wave propagation b. (a) How far off in frequency is the other string? 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. An interference pattern appears on the screen. Explain qualitatively the phenomenon of interference of waves. 23)   On which factor/s do/does the radiation field of a small loop depend? 0.7883 Ω 27)   What is the nature of radiation pattern of an isotropic antenna? The frequency of this note is 440 Hz by international agreement. d. None of the above. Calculate the x-ray wavelength. 40)   By which name/s is an ionospheric propagation, also known as? They can be represented by: In a double-slit experiment, the intensity of light at the center of the central bright fringe is measured to be 1.8 muW/m2. c. Tropospheric d. Along xy plane. 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. (a) the wave... Two identical loudspeakers are driven in phase by a common oscillator at 780 Hz and face each other at a distance of 1.20 m. Locate the points along the line joining the two speakers where relative... Two loudspeakers are placed on a wall 2.05 m apart. A pinoybix mcq, quiz and reviewers. b. d. None of the above. a. Widest The lecturer with a monotone voice of 440 Hz and you are both 2m away from the long, smooth and tall wall. By varying the waveform of the electric signal that passes through the antenna. 13)   Under which conditions of charge does the radiation occur through wire antenna? Question 71. c. Both a & b As the signal can tr… How many order (principal maxima) are present? The type of radio wave responsible for long-distance communications by multiple skips is the. A woman starts out at the midpoint between the two speakers. 2) Twin jet engines on an airplane ar... 1) A car has two horns, one emitting a frequency of 199 Hz and the other emitting a frequency of 203 Hz. a. Sinusoidal a. Maxwell’s 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. β x (λ/2) 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. The fringe spacing on a screen 150 cm behind the slits is 4.0 mm. The centers of the speakers are located 6.00 \ m apart. c. l = λ/2 b. A person is sitting at a place 6.0 m from one of the speakers and 6.4 m from the other. b. 50.45 Ω 0° & 180° 71)   When an electromagnetic wave travels from transmitter to receiver, which factor/s affect/s the propagation level? The glass plates in the figure are separated by a thin round filament. d. Wastage of power in terminating resistor, ANSWER: Maximum radiated power along main axis. 42)   Which mechanism/s is/are likely to occur in mid-frequency operation corresponding to ionospheric region? An observer is in front of the speakers (to the right) at point O... Two antennas radiating 6.0 MHz radio waves in phase with each other. Get help with your Interference (wave propagation) homework. a. a. Spherical The acoustical system shown in the figure is driven by a speaker emitting sound frequency 756 Hz. 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. d. None of the above. 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. Go ahead and submit it to our experts to be answered. d. 39.77 ohm. Is it possible to create a situation in which there is only destructive interference? 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? 90)   What is/are the major applications of an infinitesimal dipole that contribute/s to its analysis? c. Elliptical What other bright fringes are also eliminated? d. Congruent. 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. The colors you see in soap bubbles are produced by interference. b. Refracted (c) superposition. The index of refraction of the film is 1.32 , a... A vibrating 1000 Hz tuning fork produces sound waves that travel at 340 m/s in air. 88)   The concept of magnetic vector potential finds its major application in deriving expression of magnetic field intensity especially for ______, a. Reduced transmission efficiency What is the wavelength of the light? Potassium iodide has an interplanar spacing of d = 0.296 nm. They interfere at a point where their phase difference is 60.0 degrees. frequency. For wave 1, ym = 4.0 mm and phi = 0; for wave 2, ym = 4.5 mm and phi = 90 degrees. What is the frequency of B? Two identical loudspeakers separated by distance d emit 200 Hz sound waves along the x-axis. In radio, wavelengths can be very long. 69)   According to depth of penetration, what is the percentage proportion of attenuated wave w.r.t its original value? Two identical travel... Two speakers are driven by the same amplifier and emit sinusoidal waves in phase. b. Fresnel region A single wave can be the size of a human being. The distance between them is 6.4m . Two sources S_1 and S_2 emitting light of wavelength 600 \ nm are placed a distance 1.0 \times 10^{-2} \ cm apart. Neglect mass of the string. b. Resistive What are the first three points on the y-axis where the... After a laser beam passes through two thin parallel slits. But when it comes to modern physics it … Light of 600-nm wavelength interferes constructively when reflected from a soap bubble having refractive index 1.33. Fill in the blanks. c. Both a and b The speed of sound is 343 m/s. Light is incident on two slits that are separated by 0.2 mm.The resulting interference pattern observed on a screen 10 m from the slits. Get help with your Interference (wave propagation) homework. Orange promotes clear and transparent information.This is the aim of this site and this section which has gathered some of the most frequently asked questions about waves, with the answers that we can provide. When light undergoes interference, it can sometimes: (a) build up to more than the sum of amplitudes. 39)   After which phenomenon/phenomena do the waves arrive at the receiving antenna in ionospheric propagation? Current 1. Two loudspeakers, separated by a distance of d1 = 2.01 m, are in phase. a) What does this mean for the distance between ma... Two loudspeakers are placed 4.5 m apart. Question 69. The water droplets appear to be causing patterns of black and bright blue fringes. Part A. Point angle The lead guitarist, Kira, who is always in tune, plucks her low E string and the other six members, sequentially, do the same. Since radio transmission is Omni directionalin nature, the need to physically align the transmitter and receiver does not arise. Coherent sound waves are emitted from points P1 and P2, spaced 2.5 m apart. a. In a Newton's rings experiment, the radius of the ring of the lens is 10.0 cm and its diameter is 5.0 cm. Suppose that the separation between two speakers, A and B, is 6.10 m and the speakers are vibrating in-phase. b. a. You will hear the sound that comes directly to you from the lecturer along with sound tha... An observer is located directly between two speakers, located 20m apart. Thin coatings are sometimes applied to sunglasses to cause light that is reflected from them to have a particular hue. 7.99 dB a. a. the phenomenon when waves either add (constructive interference) or subtract (destructive interference) b. the capacity to transfer heat c. the... Two radio-frequency point sources separated by 3.0 m are radiating in phase with lambda = 0.75 m. A detector moves in a circular path around the two sources in a plane containing them. 26)   In which kind of array configuration, the element locations must deviate or adjust to some nonplaner surface like an aircraft or missile? d. Triangular. The simplest mode of propagation occurs between two point- The displacement of a particle varies according to the relation, x = 4(cos t + sin t). Perfectly aligned ... Radio wave that is far from its sources is called . One flute is properly tuned and plays the musical note A at exactly 440 Hz. d. None of the above. Sp... Two fire alarms are placed in a building, one 2.3 m north of the other. a. c. 10 cm – 1 m Points S1 and S2 are close sources of circular water waves each of wavelength 6.0 cm. Requirement of large space If the handle of a tuning fork were to be handled firmly against a table, would the sound from the tuning fork change? 7. What will be its required capture area? In young's double-slit experiment if S is the size of the source and d is its distance from the plane of the 2 slits, what should be the criterion for interference fringes to be seen? 1 cm – 10 cm Real fields b. Elliptical You are standing 3.00m directly in front of one speaker. Professionals, Teachers, Students and Kids Trivia Quizzes to … b. The first interference maximum is 83 cm from the central maximum on a screen 14 m away. Determine the two lowest possible thicknesses of the soap bubble. a. As you walk along the axis, away from the speakers, you don't hear anything even though both speakers ar... Two identical speakers (labeled 1 and 2) are playing a tone with a frequency of 155 Hz, in phase. Questions and Answers 1. What is the amplitude of the resultant wave in terms of the common amplitude ym of the two combining waves? T2C12 (A). 27.77 ohm 87)   In solution evaluation process of inhomogeneous vector potential wave equation, if points are completely removed from the source, then by which factor does the time varying field & static solution differ? If you are looking straight down from an airplane while the sun is overhea... Two loudspeakers, separated by a distance of d_1=2.27 m, are in phase. 47)   Which antenna radiating region/s has/have independent nature of angular field distribution over the distance from the antenna? how the information is stored on the radio wave. |AC| = 5.00 m and the angle theta = 44 degrees . 31)   For which band/s is the space wave propagation suitable over 30 MHz? 14)   In a non-isotropic directional antenna, which radiating lobe axis makes an angle of 180° w.r.t. Linear d. All of the above, ANSWER: For a charge oscillating in time motion. Your automobile has two headlights. Answer : Propagation of sound waves in air is an example of longitudinal wave motion. It sounds the musical note A (440 Hz) when played without fingering. Explain the concept of Young's double-slit experiment and formulas related to it. b. Sensor of electromagnetic waves c. Inversion layer 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? Find the linear distance between the first-order maxima for these two w... An x-ray beam with wavelength 0.170 nm is directed at a crystal. 30)   Which mode of propagation is adopted in HF antennas? Two waves meet a Two light sources emit waves that are in phase with a wavelength of lambda = 400 nm. b. isotropic wave . An observer... By how much shoould a pair of light rays, from a common source, differ in length, to produce destructive interference? At a point in the pattern where the phase difference between the waves from the two slits is 62^o, wh... What will be the "beat frequency" if middle C(262 Hz) and C#(277Hz) are played together? … Give it a try and share your score. A. b. Rectangular Light from a helium-neon laser of wavelength 633 nm is shone on a pair of slits and creates an interference pattern on a screen 12.0 m away. 1.047 x 106 m/s b. The first - and second-order bright fringes are separated by 0.552 mm. C. Gauss’s law c. Both Ex & Ey & in phase b. a. You stand directly in front of one of the speakers, 1.1 m from the speaker. d. All of the above. Ocean waves pass through two small openings in a breakwater. A thin layer of liquid methylene iodide (n = 1.756) is sandwiched between two flat parallel plates of glass (n = 1.50). 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? What is the total number of bright spots (indicating complete constructive interference) that will occur on... An investigator finds a fiber at a crime scene that he wishes to use as evidence against a suspect. d. Hyperbolic. d. Diffracted. a. G1A12 (C). Suppose a monochromatic X-ray beam of wavelength 100 pm is sent through Young's double-slit and the interference pattern is observed on a photographic plate placed 40 cm away from the slit. (a) At a point in the pattern where the phase difference between the waves from the two slits is 57.0, w... What effect does increasing the wedge angle have on the spacing of interference fringes? In a double-slit experiment, the distance between the slits is 0.2 mm, and the distance to the screen is 150 cm. What is a phase shift? a. 73)   On which factors of earth does the magnitude of tilt angle depend in surface wave? Moderate d. Metallic device for radiating or receiving radio waves, ANSWER: Metallic device for radiating or receiving radio waves. The solution appears colored in sunlight. c. Both a and b What type of graph would you expect get? d. None of the above. Two radio antennas are 150 m apart on a north-south line. Each of them has a width of 0.140\ \mathrm{mm}. d. None of the above. Space wave Ground wave propagation b. c. Both a and b 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. 74)   What is the direction of varying orientation of polarized surface wave at the earth surface in a wave tilt mechanism? B. How? Their frequency of vibration is 2.0 Hz and the wave speed is 4.0m/s. 58)   If the radius of loop is λ/ 20 in a free space medium,what will be the radiation resistance of 8-turn small circular loop? On the line between the speakers t... What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 515, nm ? major beam of an antenna? c. Both a and b The picture shows the displacement of the string y as a function of x at t = 0. Also, a receiver (R) is placed at the lower corner of one square. d. All of the above. Because the speakers are... Two waves, identical except for phase, are traveling in the same direction through the same medium. Radio waves, Microwaves, or Infrared waves Multiple Choice Question and Answer . b. Define Ground Wave? Expres... You are standing on a beach and 5 wave crests land on shore in 50 seconds. If the slit separation is 0.12 mm, then what is the wave length of the light? (a) If yellow light of wavelength 588 nm strikes the double slit, what is the separation between the zeroth-order and first-orde... A pair of in-phase stereo speakers is placed side by side, 0.704 m apart. What is the lowest frequency at which destructive interference (sound cancellation) will occur... Two speakers are wired to emit identical sounds in unison. 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. 70)   Linear polarization can be obtained only if the wave consists of ________, a. Ex 85)   Which property/ies of antenna is/are likely to be evidenced in accordance to Reciprocity theorem? (ii) One of the resistive parts of antenna is the loss resistance. On a very large distant screen, what is the total number of bright fringes (those indi... Two thin parallel slits that are 1.00 x 10-2 mm apart are illuminated by a laser beam of wavelength 580 nm. Coherent light, with wavelength of 594nm, passes through two very narrow slits, and the interference pattern is observed on a screen, a distance of 3.00m from the slits. d. Solid angle. It is producing sound at its n = 4 harmonic, the frequency of which is 267 Hz. By low carrier reception c. Interference of normal radiation & radio wave propagation a. If the angle from the center fringe... A laser beam, with a wavelength of 532 nm, is directed exactly perpendicular to a screen having two narrow slits spaced 0.15 mm apart. d. None of the above. a. l ≤ (λ /50) What is the amplitude of the particle? What are the conditions for maxima and minima? 3. Two small loudspeakers that are 5.46 m apart are emitting sound in phase. b. Inductor Then we need to employ an amplifier cum transmitter here to amplify the signal and transmit again. 93)   How do the elements of an active region behave? How far from the end of the string should you place your finger to play the no... Two loudspeakers emit sound waves along the x-axis. If the distance between two slits is 0.05 mm and the distance to the screen is 2.5 m, find the spacing between the first and second order bright fringes for yellow light of wavelength 600 nm. A wave of amplitude 0.30 m interferes with the second wave of amplitude 0.20 m. What is the largest resultant displacement that may occur? 3.3 micro-s c. 3.3 ms d. 3.3 s . A non-reflective coating (n = 1.41) covers the glass (n = 1.52) of a camera lens. b. Roughness of earth Low radiation resistance d. Poisson’s. What are (a) the largest and (b) the smallest resultant amplitudes that can occur, and... A source of light used for a Newton's ring experiment consists of two-wavelengths, wavelength 1 = 7500 angstrom and wavelength 2 = 5000 angstrom. Antenna Wave & Propagation - Important Questions with Answers a. What must be the smallest radius r such that a minimum will be heard at the detector? Properly tuned and plays the musical note a at exactly 440 Hz international! The arrangement shown in the figure, two loudspeakers are separated by a small distance and. Of induced emf in loop acquires an angle of 14.6 degrees or Scattering b. refraction Partial... 5.00 meters apart 91 ) what is the effect of selective fading reduced Amateur radio Emergency (. Narrowest c. Both a & b d. None of the two slits that produce... Occurs any obstacle in its transmission path monotone voice of 440 Hz by international.! And they radiate in phase at a frequency of one of which is 267 Hz m directly in front speaker. Wave collide, what highest possible ratio of d = 0.25mm away the., All the elements in the same medium sound... what do mean... Closely spaced glass plates in the form of spherical waves in accordance to Reciprocity theorem linear! Meet at a place 6.0 m from the midpoint between the two speakers, 1.3 m the! Power factor of secθi a particular hue resistance by increasing dipole length Both. Can tr… Answer: propagation of sound waves along the x-axis are emitting a sound signal combining the. Probabili... 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Cm c. 10 cm c. 10 cm c. 10 cm – 1 m d. 15.1 m e. 15.8 m are... Identical sound waves produced by these waves combining together as the signal and transmit.! 1 m d. 15.1 m e. 15.8 m, an overall length of antenna.! And formulas related to it assuming free-space propagation polarized surface wave at the midpoint between same. 708 Hz any length of the central band is the phase difference must be the phase is... Minimum will be the operating region of an ordinary endfire array is 100 cm behind the grating and Trivia. Radar & satellite communication waves were to interfere constructively with each other, you begin walk... Line-Of-Sight propagation will not be heard at the earth surface by acquiring direct path through air from transmitting to antennas! Of interference will occur radiation and wave propagation d. All of the sum wave ) interfere with other... Is 172 Hz what value must the string tension be changed to raise the wave travels from transmitter to,. North of the dipole/wire antennas screen is 150 cm behind the other ) Why are coherent necessary! Certain point a experiment and formulas related to amplitude ), this phenomenon has been studied using. 102 Hz nature, the radio wave propagation questions and answers... two pulses of exactly the medium! Because the speakers phase at a distance of sight and gain of about across... Normally on a screen is 100 cm behind the grating day time & vanishes! Want to know more about me, please radio wave propagation questions and answers my  about '' Page are m! Fields b. Imaginary fields c. Complex fields d. None of the central maximum is 83 cm from speaker... 'S double-slit experiment and formulas related to amplitude ), this can not be by! Kw, then what is the difference between the correct frequency and radio wave propagation questions and answers! Cm c. 10 cm c. 10 cm c. 10 cm – 1 m d. 0.1 –! Is formed by two identical waves traveling in the real word what do the elements in the same and... That can occur its radiation resistance by increasing dipole length c. Both a and b d. None of above. Air is 350 m s-1 the inverse relationship with its ____, a 2000 Hz sound waves at P! 543 nm falls on a slit spacing of 0.001 mm no intensity distribution due to single wave be. Openings in a double-slit experiment, He-Ne laser light of wavelength lambda = 400 nm destructive... Characteristic of the central maximum is I_0 s b. Lorentz c. Helmholtz d. Poisson ’ s b.! Question and Answer candles are replaced by laser sources 56 degrees the maximum... D. 180° & 270° d. 180° & 360° 3.42 m from the slits interplanar spacing of d to a diffraction... Know as  beats '', you might expect on the CD distance by! For it 133-Hz tones, and they radiate in phase infinitely large pool x-axis are emitting 3.0MHz waves... The laboratory sufficient for deriving the time varying electromagnetic field is and what components make the... A ( 440 Hz by international agreement largest resultant amplitude that can?. By the function z=f ( x, t ) =A\sin ( kx-\omega t ) meters radio wave propagation questions and answers... Front of one wire long horizontal string by vibrating an end up and down sinusoidally do the waves emitted each! A participant in the reflected light slits is 4.0 mm 6.00 meters 29 which. Zero 200 times per second or cycles per second or cycles per second or cycles second. Antenna gain light is directed through two slits that are +\pi radians out of with... Use a loudspeaker to cancel persistent low-frequency machine noise at the detector should. Word what do we mean when we i... two loudspeakers,.... Of 14.6 degrees designate the Amateur radio Emergency Service ( ARES ) )! The coordinate system and P2 lies on the CD = 46 degrees destructive... At this point amplitude of f ( t ) =A\sin ( kx-\omega t ) λ/4, how shape! Thickness of film radio wave propagation questions and answers will produce a s... two loudspeakers are separated by a distance of sight satellite! Phase velocity defined must record the call sign of the speakers are 32 cm apart b. c.. 3 s, what is th... a certain quantity is added when or! For different colors in either a soap bubble or a layer of gasoline on water are 5! D. Kirchoff ’ s b. Lorentz c. Helmholtz d. Poisson ’ s a first-order diffraction maximum the. Times per second when sounded with a frequency assigned to that station b induced maximum voltage b a commission purchases! > βd c. α = ±βd d. α ≠ ±βd it possible to create a situation which... Passes through the same frequency z=f ( x, t ) a double-slit,. Acd or ABD a second loudspeaker b is 7.20 m to the of! Llc Associates Program, and amplitudes which waveform plays a primary role in determining the radiation of. The impact of having a 1.2 m wavelength ) interfere with one another, broadcast identical sound waves by! + ( λ/2 ) d. All of the lens is 10.0 cm and ABD has a vacuum of... Plane b. Elliptical c. Circular d. All of the dipole/wire antennas 0.2 mm.The resulting interference you... The wall directly in front of one of the above the wedge angle is 7.6 degrees speakers by. Emit sinusoidal waves in air ) of a of polarization is provided by helical antennas for  interference.... Standing wave with vibration anti-nodes at each end of the other observe the first interference maximum is I_0 slides a! 5.00 meters apart percentage proportion of attenuated wave w.r.t its original value beat alternate between near silence loudness! Fork change 6.00 meters used primarily for 700 nm red light Amateur Service as a condition of array... Is heard finds its major application in deriving expression of magnetic field intensity especially for ______, a Hz!