A bus is moving with a velocity of 5 m s - 1 towards a huge wall. The driver sounds a horn of frequency 165 Hz . If the speed of sound in air is 335 m s - 1 , the number of beats heard per second by a passenger inside the bus will be

Question

A bus is moving with a velocity of 5 m s - 1 towards a huge wall. The driver sounds a horn of frequency 165 Hz . If the speed of sound in air is 335 m s - 1 , the number of beats heard per second by a passenger inside the bus will be, 3, 4, 5, 6

MARKS App · Accepted Answer

Apparent frequency v ′ = v v - v L v - v s = 165 355 + 5 355 - 5 ∵ v L = - 5 m s - 1 , v s = 5 m s - 1 = 165 × 340 330 = 170 Hz Therefore, the number of beats heard = 170 - 165 = 5

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