A bus is moving with a velocity of $5 m/s$ towards a huge wall. the driver sounds a horn of frequency $165 Hz.$ If the speed of sound in air is $355 m/s,$ the number of beats heard per second by a passenger on the bus will be
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(b) According the concept of sound image
$n' = \frac{{v + {v_B}}}{{v - {v_B}}} \times n = \frac{{355 + 5}}{{355 - 5}} \times 165 = 170 Hz$
Number of beats $ = n' - \,n = 170 - 165 = 5$
$n' = \frac{{v + {v_B}}}{{v - {v_B}}} \times n = \frac{{355 + 5}}{{355 - 5}} \times 165 = 170 Hz$
Number of beats $ = n' - \,n = 170 - 165 = 5$
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