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Standard IX

Physics

Characteristics of Sound Waves

A small sourc...

Question

A small source of sounds moves on a circle as shown in figure (16-Q1) and an observer is sitting at O. Let $v_{1}, v_{2}, v_{3}$ be the frequencies heard when the source is at A, B and C respectively.
(a) $v_{1} > v_{2} > v_{3}$
(b) $v_{1} = v_{2} > v_{3}$
(c) $v_{2} > v_{3} > v_{1}$
(d) $v_{1} > v_{3} > v_{2}$

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Solution

(c) $ν_{2} > ν_{3} > ν_{1}$

At B, the velocity of the source is along the line joining the source and the observer. Therefore, at B, the source is approaching with the highest velocity as compared to A and C. Hence, the frequency heard is maximum when the source is at B.

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A small source of sounds moves on a circle as shown in figure (16-Q1) and an observer is sitting at O. Let v1, v2, v3 be the frequencies heard when the source is at A, B and C respectively. (a) v1>v2>v3 (b) v1=v2>v3 (c) v2>v3>v1 (d) v1>v3>v2

(c) ν2>ν3>ν1 At B, the velocity of the source is along the line joining the source and the observer. Therefore, at B, the source is approaching with the highest velocity as compared to A and C. Hence, the frequency heard is maximum when the source is at B.

(c) $ν_{2} > ν_{3} > ν_{1}$

At B, the velocity of the source is along the line joining the source and the observer. Therefore, at B, the source is approaching with the highest velocity as compared to A and C. Hence, the frequency heard is maximum when the source is at B.