Question

Q. 7. If the time taken in an echo is 5
seconds, which among the following
will be the approximate distance of
the object from the source of sound?
(assume normal room temperature at
20 degree Celsius).​

Answer 1

Answer:

857.5 m

Explanation: If the time taken in an echo is 5 seconds, that means the sound takes (5/2) 2.5 seconds to travel to the object from the source of sound. The speed of sound is 343m/s, so,

Distance = Speed * Time

Distance = 343 * 2.5 = 857.5m (Approx. 860m)