First slide

Doppler's effect

Question

A source is moving towards an observer with a speed of 20 m/s and having frequency of 240 Hz. The observer is now moving towards the source with a speed of 20 m/s. Apparent frequency heard by observer, if velocity of sound is 340 m/s, is

Easy

A

240 Hz
B

270 Hz
C

280 Hz
D

360 Hz

Solution

$n' = n (\frac{v + v_{O}}{v - v_{S}}) = 240 (\frac{340 + 20}{340 - 20}) = 270 Hz$

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