Question

Calculate the minimum distance at which a person should stand in front of a reflecting surface be able to hear an echo ( speed of sound in air = 340 m/s)​

Answer 1

Answer:

The human ear can hear two sounds distinctly only if there is a time interval of

10

1

seconds between them. Now, the speed of sound in air at 20

0

C is 340m/s, so the distance traveled in

10

1

seconds will be:

Distance = Speed X time

=340×

10

1

=34m

Thus, it is possible to hear the echo at the minimum distance of

2

34

=17m between the source of sound and reflecting surface.

Answer 2

Answer:

17m

Explanation:

SPEED OF SOUND IN AIR AT 20C=340M/S

TIME TO BE TAKEN TO HEAR AN ECHO=1/10SEC

WE KNOW THAT D=S*T

340*1/10=34M

34/2=17M

HOPE IT HELPS YOU MARK AS BRAINLIEST（￣︶￣）↗