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Sound Wave:Displacement Equation

A car approac...

Question

A car approaching a crossing at a speed of $20 m / s$ sounds a horn of frequency $500 H z$ when $80 m$ from the crossing. Speed of sound in air is $330 m / s .$ What frequency is heard by an observer $60 m$ from the crossing on the straight road which crosses car road at right angles?

A

500 H z

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B

326 H z

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C

526 H z

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D

426 H z

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Solution

The correct option is C $526 H z$

Given, $v_{c} = 20 m sec & f = 500 H z$
We have to find the apparent frequency.

The situation in the question is as given in the diagram.

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