First slide

Doppler's effect

Question

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

Easy

A

2210 Hz
B

1920 Hz
C

2068 Hz
D

2086 Hz

Solution

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

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