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The engine of a train sounds a whistle at frequency . The frequency heard by a passenger is
(a)
(b)
(c)
(d)

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Important Questions on Sound
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An observer moves on a circle as shown in the figure and a small sound source is at . Let at , , be the frequencies heard when the observer is at , , and , respectively.

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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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