Question

why can we hear echoes in long gallaries and big halls..?​

Answer 1

Explanation:

A sound persists in our ear for 0.1 s. At temperature 22℃ in air and speed of sound 344 ms-1, the total distance covered by sound from the point of generation and reflecting surface and back should be at least (344 m/s) x 0.1 s = 34.4 m. Thus, the minimum distance between the point of generation and reflecting surface should behalf of it i.e. 17.2 m. So, in a long gallery and big halls, we can hear the echo due to the distance between the point of generation and reflecting surface more than the minimum distance required in given conditions.

Hope this helps.

MARK AS BRAINLIEST.

Answer 2

To hear an echo clearly, the time interval between the original sound and the echo must be at least 0.1 s.

Since the speed of sound in air is

344 m/s, the distance travelled by sound in 0.I s = 344 m/s x 0.1 s = 34.4 m.

So to hear an echo clearly, the minimum distance of the reflecting surface should be half this distance that is 17.2 m.

Because the distance between us and the obstacle should be 17.2m for hearing the echo.

In small rooms there is no 17.2m distance. So we cant hear any echo.

Whereas in a big hall there is 17.2m distance. So we can hear many echo.

I hope it will be helpful to you.

Please mark me as brainliest and follow me.

Thank you