Doppler Effect in Sound Waves and Its Applications questions with solutions

Showing 1–10 of 32 questions

• MCQmediumWave MotionDoppler Effect in Sound Waves and Its Applications

  A stationary source and a stationary reflecting wall lie on opposite sides of an observer. The source emits frequency f. The observer moves towards the wall with speed u, so the direct wave reaches the observer from behind while the reflected wave reaches from ahead. What is the beat frequency heard by the observer?

  Options

  • Option A

    fu/v

  • Option B

    2f×u/v

  • Option C

    f×v/(v-u)

  • Option D

    2f×v/(v+u)

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• Multi-correctmediumWave MotionDoppler Effect in Sound Waves and Its Applications

  A source of frequency f moves through still air with speed uₛ < v. Which statements are correct?

  Select all that apply

  • Option A

    The wavelength in front is (v-uₛ)/f.

  • Option B

    The wavelength behind is (v+uₛ)/f.

  • Option C

    The source continues to oscillate at frequency f in its own frame.

  • Option D

    A stationary observer in front of the approaching source hears a frequency greater than f.

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• NumericdifficultWave MotionDoppler Effect in Sound Waves and Its Applications

  An audio transmitter T and receiver R are suspended from identical 8 m strings. They are displaced in opposite horizontal directions by θ₀ = cos⁻¹(0.9) and released together. The transmitter frequency is 660 Hz and sound speed is 330 m s⁻¹. With g = 10 m s⁻², find the maximum variation in received frequency in hertz.

  

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• NumericmediumWave MotionDoppler Effect in Sound Waves and Its Applications

  A stationary observer hears a moving source at 360 Hz while it approaches and at 300 Hz after it has passed and is receding. The speed of sound is 330 m/s. If the source speed is N m/s, find N.

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• Multi-correctmediumWave MotionDoppler Effect in Sound Waves and Its Applications

  For the classical Doppler effect of sound in a stationary medium, which statements are correct?

  Select all that apply

  • Option A

    Source motion changes the wavelength established in the medium.

  • Option B

    Observer motion does not alter the wavelength already present in the medium.

  • Option C

    Only velocity components along the instantaneous source-observer line enter the usual radial Doppler shift.

  • Option D

    For a source and observer approaching each other, f' = f×(v+uₒ)/(v-uₛ).

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• NumericmediumWave MotionDoppler Effect in Sound Waves and Its Applications

  A stationary source emits 320 Hz towards a large wall moving directly towards the source at 20 m/s. The speed of sound is 340 m/s. If the reflected frequency received back at the stationary source is N Hz, find N.

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• MCQmediumWave MotionDoppler Effect in Sound Waves and Its Applications

  A source of frequency f lies between a stationary observer and a large stationary wall. The source moves towards the wall with speed u. The observer simultaneously hears the direct sound and the sound reflected from the wall. Which expression gives the beat frequency between the two received sounds?

  Options

  • Option A

    fu/v

  • Option B

    2f×u/v

  • Option C

    f×v[1/(v-u)-1/(v+u)]

  • Option D

    f×(v+u)/(v-u)

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• NumericmediumWave MotionDoppler Effect in Sound Waves and Its Applications

  A stationary source emits 500 Hz. An observer moves at 34 m/s, and the observer's velocity makes an angle 60° with the line from the observer towards the source. The velocity component along the line is towards the source. The speed of sound is 340 m/s. If the apparent frequency is N Hz, find N.

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• MCQeasyWave MotionDoppler Effect in Sound Waves and Its Applications

  A sound source of frequency f moves directly towards a stationary observer with speed uₛ through still air. The speed of sound is v, with uₛ < v. Which expression gives the observed frequency?

  Options

  • Option A

    f×(v+uₛ)/v

  • Option B

    f×v/(v-uₛ)

  • Option C

    f×v/(v+uₛ)

  • Option D

    f×(v-uₛ)/v

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• MCQmediumWave MotionDoppler Effect in Sound Waves and Its Applications

  A stationary source emits frequency f towards a large reflecting wall moving directly towards the source with speed u. The reflected sound returns to the stationary source. Which expression gives the frequency received back at the source?

  Options

  • Option A

    f×(v+u)/(v-u)

  • Option B

    f×(v-u)/(v+u)

  • Option C

    f×v/(v-u)

  • Option D

    f×(v+u)/v

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