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Apparent Frequency

If a soldier ...

Question

If a soldier jumps from an aeroplane moving with a constant horizontal velocity, that the ratio of the frequency of aeroplane sound heard by him $f^{^{'}}$ and real frequency $f$ will be

A

1 : 4

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B

2 : 1

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C

1 : 2

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D

1 : 1

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Solution

The correct option is C 1 : 1
Horizontal component of the velocity of the soldier will be equal to the horizontal velocity of the aeroplane. Therefore Soldier will observe the same frequency as the airplane observe. Option "D" is correct.

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