Question

A man standing 48 m away from a wall fires a gun calculate the time after which an echo is heard . Speed of sound is 320m/s

Answer 1

Speed=distance/time

So time = distance/speed

T=d/t

In this case the sound will reflect back from wall so

T=2d/t

T=2*48/32

T=0.3 s

Hope this helps

Answer 2

Answer:

we know,

speed=distance/time

so, time= distance/speed

since, the sound reflects back from the wall when a man fires a gun

Then,

Time = 2*distance /speed

= (2*48/320)seconds

=0.3seconds

This is your answer