First slide

Doppler

Question

A man standing on a platform hears the sound of frequency 605 Hz coming from a frequency 550 Hz from a train whistle moving towards the platform. If the velocity of sound is 330 m/s, then what is the speed of train?

Moderate

A

30 m/s
B

35 m/s
C

40 m/s
D

45 m/s

Solution

$n' = n (\frac{v - v_{o}}{v - v_{s}})$ , $605 = 550 (\frac{330 - 0}{330 - v_{s}})$ $\Rightarrow$ $v_{s} = 30 m / s$

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