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A source of sound of frequency f(1) is p...

A source of sound of frequency `f_(1)` is placed on the ground. A detector placed at a height is released from rest on this source. The observed frequency f(Hz) is plotted against time t(sec). The speed of sound in air is 300m/s. find `f_(1)(g=10m//s^(2))`.

A

`0.5xx10^(3)Hz`

B

`1xx10^(3)Hz`

C

`0.25xx10^(3)Hz`

D

`0.2xx10^(3)Hz`

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The correct Answer is:
B
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