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A person is listening to two trains one ...

A person is listening to two trains one approaching him while the other moving away from him. The speed of both the trains is 5 m/s. If both trains give off whistle of their nature frequency of 280 Hz then the observer will hear ... no of beats/s. (Velocity of sound = 350 m/s)

A

6

B

7

C

5

D

8

Text Solution

Verified by Experts

The correct Answer is:
D
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