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![[Post New]](/templates/default/images/icon_minipost_new.gif) 27 Mar 2007 11:21:38 IST
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A person standing between two parallel hills fires a gun. He hears the first echo after 1.5 seconds and the second echo after 2.5 seconds. If the speed of sound in air is 332 m/s, calculate the distance between the hills. When will he hear the next echo?
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27 Mar 2007 15:45:00 IST
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He will hear first echo due to reflection of sound from one hill and second due to other.
In 1.5 s the sound travels 2*distance between the person and one hill.
So distance between that hill and the person x=1.5*332/2=249m
Similarly distance between another hill and the person y=415m
So distance between hills=x+y=664m
He will hear next echo after 3s from the beginning due to reflection of sound from 1st hill.
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ADARSH
NITK Surathkal
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29 Mar 2007 09:03:54 IST
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hey thnx KAB..though i later figured it out myself...neway rated u...
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