A person is standing between 2 parallel cliffs that are separated by a distance of 1000m. He claps his hands and hears the first echo after 2s. If the speed of sound is 330 m/s, after how much time will he hear the second echo?
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Answer:
he will hear the echo after 0.63 seconds.
Explanation:
d=1000m
t1=2s
v=300m/s
t2=?
2d1=v/t
d1=v/2t
x=300/2*2=75m
d2=1000-x
t2?=
v=300m
2d2=v/t
1000-x=300/2t
1000-75=300/2t
925=300/2t
t=300/925*2
t=0.63 seconds
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