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A vehicle, with a horn of frequency n is...

A vehicle, with a horn of frequency n is moving with a velocity of 30 m/s in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency `n + n_(1)`. Then (if the sound velocity in air is 300 m/s)

A

`n_1=0.1 n`

B

`n_1=0`

C

`n_1=10n `

D

`n_1=-0.1 n`

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The correct Answer is:
B
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