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Waves Test - 69
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Waves Test - 69

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  • Question 1/10
    4 / -1
    A small source of sound moves on a circle as shown in the figure and an observer is standing on O . Let n1, n2 and n3 be the frequencies heard when the source is at A, B and C respectively. Then

    Solutions

  • Question 2/10
    4 / -1
    A source emits a sound of frequency of 400 Hz, but the listener hears it to be 390 Hz. Then
  • Question 3/10
    4 / -1
    A source and an observer are moving towards each other with a speed equal to v/2 where v is the speed of sound. The source is emitting sound of frequency n. The frequency heard by the observer will be
    Solutions

  • Question 4/10
    4 / -1
    A police car horn emits a sound at a frequency 240 Hz when the car is at rest. If the speed of the sound is 330 m/s, the frequency heard by an observer who is approaching the car at a speed of 11 m/s, is :
    Solutions

  • Question 5/10
    4 / -1
    A person carrying a whistle emitting continuously a note of 272 Hz is running towards a reflecting surface with a speed of 18 km/hour. The speed of sound in air is 345 ms–1. The number of beats heard by him is
    Solutions

  • Question 6/10
    4 / -1
    The speed of sound in air is 340 m/s. The speed with which a source of sound should move towards a stationary observer so that the apparent frequency becomes twice of the original
    Solutions

  • Question 7/10
    4 / -1
    A bat flies at a steady speed of 4 ms–1 emitting a sound of f = 90 × 103 Hz. It is flying horizontally towards a vertical wall. The frequency of the reflected sound as detected by the bat will be (Take velocity of sound in air as 330 ms–1).
    Solutions

  • Question 8/10
    4 / -1
    A source of sound is approaching an observer with speed of 30 ms–1 and the observer is approaching the source with a speed 60 ms–1. Then the fractional change in the frequency of sound in air (330 ms–1) is
  • Question 9/10
    4 / -1
    A police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/hr 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
    Solutions

  • Question 10/10
    4 / -1
    A source is moving towards a stationary observer, so that the apparent frequency increases by 50%. If velocity of sound is 330 ms–1, then velocity of source is
    Solutions

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