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a person in a cave emits a sound and receives an echo
Sent to General Experts December 29 05:51 PM

A person in a cave emits a sound and receives an echo 2.5 seconds later. How far away is he from the wall?

Dr WLS Requested

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December 29 7:30 PM (1 hour and 39 minutes and 23 seconds later)
         
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Let X be the distance from the wall. The sound must make a round trip of 2 X before the echo is heard. You need to know the speed of sound, which depends upon temperature. 340 m/s is a pretty good value for a cold cave. The product of sound speed V and time is the distance travelled. Thus

340 m/s * (2.5 s) = 2 X

X = 425 meters



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Dr WLS -- PhD -- 97% Positive Feedback on 86 General Accepts
PhD degree in engineering/physics , online tutor since 1994 in general subjects
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