How much distance the boy should move from his original position towards the cliff so that he is able to hear the echo of the gunshot?

Let the distance of the cliff from the initial position of the man be ‘d’ m. On moving closer to the cliff by a distance of 82.5 m, the distance = 2 (d – 82.5) m.

Why do we not hear the echo if you shout when you are very close to the cliff?

Sound waves can bounce off smooth, hard objects in the same way as a rubber ball bounces off the ground. Although the direction of the sound changes, the echo sounds the same as the original sound. The echo will not be heard because the minimum distance between the source and the reflecting surface should be 17 m.

How do you calculate echo time?

For example, if the speed of sound in water is 1500 meters per second and the fisherman’s sonar device detects an echo in 0.02 seconds, the distance of the object under water will be d = v*t = 1500 meters per second * 0.02 seconds = 30 meters (back and forth).

What causes an echo physics?

An echo is a sound that is repeated because the sound waves are reflected back. Sound waves can bounce off smooth, hard objects in the same way as a rubber ball bounces off the ground. Although the direction of the sound changes, the echo sounds the same as the original sound. But sounds are not always reflected.

What is echo formula?

Hint: Echo is the repetition of a sound produced by the reflection of sound waves from a reflector and can be heard differently from the source. Hence, to hear an echo of a sound the interval between reaching the main sound and echo must be $\dfrac{1}{10}$ seconds. We can use the formula, distance \[d = V \times t\].

What is echo explain?

What is a sound echo?

Acoustics / Electroacoustics. An echo is a repetition or a partial repetition of a sound due to REFLECTION. REVERBERATION is also reflected sound, but in this case, separate repetitions of the original sound are not distinguishable.

What causes echoes and reverberations?

Reverberation is the persistence of sound after the sound source has been stopped. It results from a large number of reflected waves which can be perceived by the brain as a continuous sound. On the other hand, an echo occurs when a pulse of sound can be heard twice.