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A bus driving along at 39.6 kmph is appr...

A bus driving along at 39.6 kmph is approaching a person who is standing at the bus stop, while honking repeatedly at an interval of 30 seconds. If the speed of the sound is 330 m/s, at what interval will the person hear the horn ?

A

31 seconds

B

29 seconds

C

30 seconds

D

The interval will depend on the distance of the bus from the passenger

Text Solution

Verified by Experts

The correct Answer is:
B
`v=39.6km//hr=11m//s,`
`t_(1)=(d)/(330)andt_(2)=(d-11xx30)/(330)`
Now `Deltat=t_(1)-t_(2)=1`
now `t_(1)|=30sec therefore t_(2)=29sec`
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