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 $300\, m/s$)
AIIMS 2000,AIPMT 1998, Easy
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(b) In this case Doppler’s effect is not applicable.
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