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Physics-

General

Easy

Question

A small source of sound moves on a circle as shown in the figure and an observer is standing on $O$ . Let $n subscript 1 end subscript comma n subscript 2 end subscript$ and $n subscript 3 end subscript$ be the frequencies heard when the source is at $A comma B$ and $C$ respectively. Then

$n_{1} > n_{2} > n_{3}$
$n_{2} > n_{3} > n_{1}$
$n_{1} = n_{2} > n_{3}$
$n_{2} > n_{1} > n_{3}$

The correct answer is: $n subscript 2 end subscript greater than n subscript 3 end subscript greater than n subscript 1 end subscript$

At point A, source is moving away from observer so apparent frequency $n subscript 1 end subscript less than n$ (actual frequency) At point B source is coming towards observer so apparent frequency $n subscript 2 end subscript greater than n$ and point C source is moving perpendicular to observer so $n subscript 3 end subscript equals n$
Hence $n subscript 2 end subscript greater than n subscript 3 end subscript greater than n subscript 1 end subscript$

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