Why is a minimum distance necessary to hear an echo?

Question: What is the minimum distance required to hear an echo? Answer: The velocity of sound in dry air is approximately 343 m/s at a temperature of 25 °C. Therefore, the reflecting object must be more than 17.2m from the sound source for echo to be perceived by a person located at the source.

How much distance is required to hear an echo?

And there’s our answer. So this means that the minimum distance the obstacle needs to be at to hear an echo is 17 meters.

Why will an echo not be heard when the distance is 10 m?

As the distance 10 m is far less than 16.6 m, therefore the ear cannot make out when the original sound had died and echo has been received. Thus, no echo is heard.

What should be the minimum distance between the listener and the reflector to hear an echo of sound propagating with a speed VM S?

Sound will travel the total distance of 2d. Therefore minimum distance of reflector from the source should be 17m.

Why does sound become faint with distance?

As distance from the sound source increases, the area covered by the sound waves increases. The same amount of energy is spread over a greater area, so the intensity and loudness of the sound is less. This explains why even loud sounds fade away as you move farther from the source.

When the distance between the source of sound and the reflecting surface is 12 m will Anecho be heard?

The echo will not be heard because the minimum distance between the source and the reflecting surface should be 17 m.

What is an echo Why can you not hear the echo if you stand 10 m away from a wall and shout towards it?

Why can an echo not be heard if you stand 10 m away from a wall and shout facing it? We cannot hear the echo because the time difference between the original sound and reflected sound will be less than 1/10th of a second. So, we are not able to distinguish between the two sounds.

What should be the minimum distance between the person and the reflector so that the person hears a distinct echo?

Thus, to hear the echo clearly in the air, the reflecting surface should be at a minimum distance of 16.5m from the source of sound.

What should be the minimum distance between a source of sound of sound and a reflector in water so that echo is heard distinctly speed of sound in water 1450 MS 1?

The wavelength of waves produced on the surface of water is 20 cm. If the wave velocity is 24 m s−1, calculate : (i) the number of waves produced in one second, (ii) the time in which one wave is produced.

How are echoes caused?

The sound waves left your mouth, traveled through the air, hit a hard surface, such as a wall, and then bounced back again, causing you to hear the sound again. An echo is made by sound waves bouncing off a hard surface.

Why can’t we hear an echo when the distance is 17 meters?

The echo can not be heard if the distance between the sound source and the reflecting surface is less than 17 metres because the time between hearing the main sound and its echo will be less than 0.1 of a second, and the human ear can not distinguish between the two successive sounds.

What are the conditions necessary for hearing the Echo?

The conditions necessary for hearing the echo The distance between the sound source and the reflecting surface must not be less than 17 metres where the time period between hearing the original sound and its echo should not be less than 0.1 of a second.

How long does it take to hear a distinct echo?

As the sensation of sound persists in our brain for about 0.1 s, to hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1s.

When will an echo be heard from an obstacle?

An echo will be heard if the minimum distance between the source of sound and the obstacle is