Q15 of 54 Page 389

Loudness and intensity of sound.

Loudness defines how loud a sound is to a listener.


Intensity is a measure of the energy contained in a wave. Its unit is decibel(dB).


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13

Infrasonic vibrations and ultrasonic vibrations.

 14

Compression and rarefaction.

 16

With the help of a labelled diagram, explain the working of the human ear.

 17

Illustrate with the help of an experiment that sound requires a medium to propagate.