Question

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

The minimum distance from reflector is 16.6 m. Answer: To hear an echo, the sound wave has to reach an obstacle and then return back to you. ... So the minimum distance required to hear an echo in air is achieved by: d=343*0.05 or, d=17.15 Therefore to hear echo in air at room temperature, the minimum distance is 17.15m.

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