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Cool goIITian

Joined:	24 Jul 2009
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24 Jul 2009 21:54:20 IST

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A boy claps his hands once every second and hears the echo from a distant building . he hears the ec

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A boy claps his hands once every second and hears the echo from a distant building . he hears the echo of each cla[p midway betn it and the next clap . if the velocity of sound is 340m/s what is the distance of the building from boy?

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Killer Kiran

Blazing goIITian

Joined: 6 Aug 2007

Posts: 1860

24 Jul 2009 21:57:36 IST

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Acc to the data given it takes 0.5s for the sound to go to the cliff, reflect and come back

for going once it takes 0.25s

distance= 340x0.25 =85 m

GRAVITY

Cool goIITian

Joined: 17 Jul 2009

Posts: 40

24 Jul 2009 22:26:50 IST

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yup, this seems to be the answer

edison

Forum Expert

Joined: 19 Oct 2006

Posts: 7537

12 Aug 2009 16:26:39 IST

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The distance is such that time taken by clapping sound to strike the wall and come back = 0.5 s

(as the clapping interval is 1 second)

Thus if distance between the wall and boy = D

Then 2D/ v = 0.5 s

here v = 340m/s

or D = 0.5 * v / 2 = 0.5 * 340 / 2 = 85 m

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