A man standing 68m from a wall fires a gun. If the speed of sound is 340ms calculate the time after which the echo is heard.
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t=d/s
for echo multiply by 2
so,
t=65/340=.19sec
for echo, t=.19 multiply by2=.38
for echo multiply by 2
so,
t=65/340=.19sec
for echo, t=.19 multiply by2=.38
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