The engine of a train moving with speed 10 m s⁻¹ towards a platform sounds a whistle at frequency 400 Hz. The…

Question

The engine of a train moving with speed $10 \, \text{m s}^{-1}$ towards a platform sounds a whistle at frequency $400 \, \text{Hz}$ . The frequency heard by a passenger inside the train is (neglect air speed, speed of sound in air = $330 \, \text{m s}^{-1}$ ):

A
$400 \, \text{Hz}$
B
$388 \, \text{Hz}$
C
$200 \, \text{Hz}$
D
$412 \, \text{Hz}$

Accepted Answer

A. $$400 \, 	ext{Hz}$$

Answer

B. $$388 \, 	ext{Hz}$$

Answer

C. $$200 \, 	ext{Hz}$$

Answer

D. $$412 \, 	ext{Hz}$$

Answer & step-by-step solution

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