1 answer

How much secs? (physics)

Question:

How many seconds will it take an echo to reach your ears if you yell toward a mountain 71 m away on a day when the air temperature is 20⁰C?


Answers

#t ~= 2.4 s#

Explanation:

The speed of sound at #20^@# is 343.6 m/s.

By the time the echo reaches the cliff and then returns to you, it has traveled #2*71 m = 142 m#.

So that time is

#t = d/v = (142 cancel(m))/(343.6 cancel(m)/s) = 2.42 s#

I hope this helps,
Steve

.

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