Question

A person fires a gun standing at a distance of 55m from a wall. If the speed of sound is 330 m/sec, find the time for an echo to be heard

Answer 1

distance of the wall from person  d=55m
 the distance travelled by sound to listen an echo  =110m
 V=330m/s
v=d/t   t=d/V    110/330   t=1/3S     
t=0.33sec

Answer 2

The time taken for the echo to be heard is

0.33 s.

Explanation:

To calculate the time taken for the echo to be heard use the formula

$t=\frac{d_{total}}{v_{sound} }$.

Here t is the time taken, $d_{total}$ total distance traveled and  $v_{sound}$ is the velocity of the sound.

The total distance traveled by the sound is given as

= 2×55 m = 110 (because it is reflected sound).

The velocity of sound given 330 m/s.

Therefore,

$t=\frac{110m}{330m/s}$

t = 0.33 s.

Thus, the time taken for the echo to be heard is 0.33 s.

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Topic :time taken for the echo

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