Question

The effect of a sound pulse lasts on the
ear for about 0.1 second. Thus for a
person to hear the echo distinctly, the
minimum distance of the reflector is
about
(a) 10 meter
(b) 15 meter
(d) 100 meter
(c) 50 meter
give answer through explanation.​

Answer 1

Answer:

To hear an echo distinctly (as a separate sound) must be satisfied with certain conditions. For about 0.1 seconds the sensation of any sound persists in our ear. That is known as hearing persistence.

Explanation:

To hear an echo distinctly (as a separate sound) must be satisfied with certain conditions. For about 0.1 seconds the sensation of any sound persists in our ear. That is known as hearing persistence.