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  4. A vehicle, with a horn of frequency n , is moving with a velocity of 30ms- 1 in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency n+n1. Then, n1 is equal to: (take velocity of sound in air as 330ms- 1 ):

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Q. A vehicle, with a horn of frequency $n$ , is moving with a velocity of $30ms^{- 1}$ 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, $n_{1}$ is equal to : (take velocity of sound in air as $330ms^{- 1}$ ):

NTA AbhyasNTA Abhyas 2020

Solution:

Due to perpendicular motion there is no relative motion so there is no doppler effect means $n_{1}=0$ .