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 ):

Question

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 ): (A) n1=10n (B) n1=-n (C) n1=0.1n (D) n1=0

Tardigrade Admin · Accepted Answer

Due to perpendicular motion there is no relative motion so there is no doppler effect means n1=0 .

$n_{1} = 10 n$

$n_{1} = - n$

$n_{1} = 0.1 n$

$n_{1} = 0$

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

n1​=10n

n1​=−n

n1​=0.1n

n1​=0

Due to perpendicular motion there is no relative motion so there is no doppler effect means n1​=0 .

$n_{1} = 10 n$

$n_{1} = - n$

$n_{1} = 0.1 n$

$n_{1} = 0$

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