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Waves Test - 13...

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  • Question 1
    4 / -1

    A car is moving with a speed of 72 km–h -1 towards a roadside source that emits found at a frequency of 850 Hz. The car driver listens to the sound while approaching the source and again while moving away from the source after crossing it. If the velocity of sound is 340 ms -1 , the difference of the two frequencies, the driver hears is

  • Question 2
    4 / -1

    A horizontal stretched string, fixed at two ends, is vibrating in its fifth harmonic according to the equation, y(x, t ) = (0.01 m) [sin (62.8 m-1 ) x cos (628 s-1 )t]. Assuming rc = 3.14, the correct statement(s) is (are)

  • Question 3
    4 / -1

    A man standing between two cliffs, claps his hands and starts hearing a series of echoes at intervals of one second. If the speed of sound in air is 340 ms -1, the distance between the cliffs is

  • Question 4
    4 / -1

    A whistle of frequency 500 Hz tied to the end of a string of length of 1.2 m revolves at 400 rev/min. A listener standing some distance away in the plane of rotation of whistle frequencies in the rays (speed of sound = 340 ms -1).

  • Question 5
    4 / -1

    A racing car moving towards a cliff, sounds its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If v is the velocity of sound, then the velocity of the car is

  • Question 6
    4 / -1

    A train is approaching with velocity 25 ms -1 towards a pedestrain standing on the track, frequency of horn of train is 1 kHz. Frequency heard by the pedestrain is (take, v = 350 ms -1 )

  • Question 7
    4 / -1

    The change in frequency due to Doppler's effect does not depends on

  • Question 8
    4 / -1

    A train approaching a railway platform with a speed of 20 ms -1 starts blowing the whistle, speed of sound in air is 340 ms -1. If the frequency of the emitted sound from the whistle is 640 Hz, the frequency of sound to a person standing on the platform will appear to be

  • Question 9
    4 / -1

    A police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/h towards a tall building which reflects the sound waves. The speed of sound in air is 320 m/s. The frequency of the siren heard by the car driver is

  • Question 10
    4 / -1

    A car sounding its horn at 480 Hz moves towards a high wall at a speed of 20 ms-1. If the speed of sound is 340 ms -1, the frequency of the reflected sound heard by the girl sitting in the car will be closest to

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