Question

4) State whether True' or False and correct the false statement:- To create an echo, the minimum distance between the source and reflector of sound should
be 1.7m​

Answer 1

Answer:

Correct option is

B

17 m

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.