A. `n_(1) = 10 n`
B. `n_(1)=0`
C. `n_(1)=0.1 n`
D. `n_(1)=-0.1 n`
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A vehicle with a horn of frequency n is moving with a velocity of 30m/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} = 10 n
(b) n_{1} = 0
(c) n_{1} = – 0.1 n
(d) n_{1} = 0.1 n
A vehicle with a horn of frequency n is moving with a velocity of 30m/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} = 10 n
(b) n_{1} = 0
(c) n_{1} = – 0.1 n
(d) n_{1} = 0.1 n
(b) n_{1} = 0
No doppler effect is observed if the source moves perpendicular to the line joining the source and the observer. Therefore, the correct choice is (b).
Correct Answer – D
No doppler effect, because velocity is perpendicular to line joining vehicle and observer.
Correct Answer – b