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Question

An engine blowing whistle, is approaching a stationary observer with a velocity of 110ms1. The ratio of frequencies heard by the observer while engine approaching and receding away from him will be (ifv=330ms1)

A
1 : 4
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B
4 : 1
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C
2 : 1
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D
1 : 2
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Solution

The correct option is B 2 : 1
when source is approaching to the observer,
n1=330330110n=(3/2)n
when source is receding from the observer,
n2=330330+110n=(3/4)n
n1n2=(3/2)(3/4)=21.
option "C" is correct.

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