First slide

Travelling wave

Question

It is possible to recognise a person by hearing his voice even if he is hidden behind a wall. This is due to the fact that his voice

Easy

A

Has a definite pitch
B

Has a definite quality
C

Has a definite loudness
D

Can penetrate the wall

Solution

Each sound has a definite quality , due to this fact a person can be recognized without seeing him.

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