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Two trains move towards each other at a ...

Two trains move towards each other at a speed of 80 km/h relative to the Earth's surface. One radiates a 520 Hz signal. What frequency will the observer on the other train hear?
How will this frequency change when the trains pass one another ?

Text Solution

Verified by Experts

The correct Answer is:
593 Hz; 456 Hz.
When the source approaches the receiver, the relation
`v=v_(0)(1+V//u)/(1-v//u)`
holds, where V and v are respectively the speeds of the receiver and the source relative to the transmitting medium. In the case of the source moving away from the receiver, the signs in the numerator and the denominator should be reversed.
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