Question

Two trains A and B are moving towards each other with a speed of 120 m/s. If the frequency of the whistle emitted by A is 800 Hz, then what is the apparent frequency of the whistle heard by the passenger sitting in train B 

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Answer 1

Explanation:

The perceived frequency (f') 

f′=f0(v+v0v−vs) 

Given, v=340m/s,v0=15m/s and vs=20m/s 

∴f′=600×(340+15340−20) 

=355320×600Hz

Answer 2

Answer:

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