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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

1920 Hz

b

2068 Hz

c

2210 Hz

d

2086 Hz

answer is C.

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Detailed Solution

$n^{'} = n (\frac{v}{v - v_{S}}) = \frac{2000 \times 1220}{(1220 - 40)} = 2068 Hz$

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