First slide

Doppler

Question

Two trains A and B are moving in the same direction with velocities 30 m / s and 10 m / s respectively. B is behind from A and A blows a horn of frequency 450 Hz. Then the apparent frequency heard by observer on train B is (speed of sound is 330 m/s):

Moderate

A

425 Hz
B

300 Hz
C

450 Hz
D

350 Hz

Solution

$f_{app} = (\frac{V + V_{0}}{V + V_{S}}) f = (\frac{330 + 10}{330 + 30}) 450$
$\Rightarrow f_{app} = 425 Hz$

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