Q1 of 54 Page 389

What is an echo?

An echo is the sound produced by the reflection of sound waves from a surface and back to the listener.


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2

What is reverberation?

 3

What is SONAR?

 4

Sound is produced by a vibrating source. Why then a vibrating pendulum does not produce any sound?

 5

What is the audible range for a normal human being?