Q.

A source of sound is travelling with a velocity 40 km/hour towards observer and emits sound of frequency 2000 Hz. If velocity of sound is 1220 km/hour, then what is the apparent frequency heard by an observer

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a

2210 Hz

b

1920 Hz

c

2068 Hz

d

2086 Hz

answer is C.

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Detailed Solution

n'=n vv−vS=2000×1220(1220−40)=2068Hz
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A source of sound is travelling with a velocity 40 km/hour towards observer and emits sound of frequency 2000 Hz. If velocity of sound is 1220 km/hour, then what is the apparent frequency heard by an observer