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A source of sound S is travelling at (10...


A source of sound S is travelling at `(100)/(3)(m)/(s)` along a road, towards a point A. When the source is 3 m away from A, a person standint at a point O on a road perpendicular to AS hears a sound of requency `v'`. The distance of O from A at that time is 4 m. If the original frequency is 640 Hz, then the value of `v'` is (velocity of sound is `340(m)/(s)`)

A

`620Hz`

B

`680Hz`

C

`720Hz`

D

`840Hz`

Text Solution

Verified by Experts

The correct Answer is:
B
`n_(1)=(V)/(V-V_(s)costheta)xxn`
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NARAYNA-WAVES-Exercise-I (H.W)
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