One train is approaching an observer at rest and another is receding him with same velocity 4 m/s. Both the trains blow whistles of same frequency of 243 Hz. The beat frequency in Hz as heard by the observer is: (Speed of sound in air = 320 m/s)
A
10
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B
6
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C
4
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D
1
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Solution
The correct option is C 6 Frequency when a source is approaching is, f1=(vv−vs)f