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The engine of a train sounds a whistle at frequency ν. The frequency heard by a passenger is

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Important Questions on Sound

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The change in frequency due to Doppler's effect does not depend on
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An observer moves on a circle as shown in the figure and a small sound source is at S. Let at υ1υ2υ3 be the frequencies heard when the observer is at A, B, and C, respectively.

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In the case of sound waves, the wind is blowing from source to receiver with speed Uw. Both source and receiver are stationary. If λ0 is the original wavelength with no wind and V is the speed of sound in the air then wavelength, as received by the receiver, is given by,
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A star is emitting yellow light. If it is accelerated towards earth, then to an observer on earth, it will appear

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When the light source is moving towards an observer,

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A source emits a sound of frequency of 400 Hz, but the listener hears it to be 390 Hz. Then
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The source of sound emits a sound wave of frequency f0.  An observer is moving towards the source with speed v. The apparent frequency listened by the observer is f. The wavelength of the sound listened by the observer is λ. If the original wavelength of sound was λ0 then
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A source of sound emits a note of frequency 500 Hz. The source is moving with speed of 30 m s-1 towards a listener and the listener is also moving towards the source at a speed of 20 m s-1 (take speed of sound 330 m s-1). Then,