Chapter 11

NCERT
Class 9
Science
Solutions
1. Distinguish between loudness and intensity of sound.

Question:

Distinguish between loudness and intensity of sound.

Answer:

Loudness Intensity
Loudness is the measure
of sensitivity of the ear
to sound which can
differentiate between
loud and soft sound.
The amount of sound
energy passing through
a unit area in one second
is called the intensity of
sound.
Loudness may be
different for different
observers that depends
on the sensitivity of the
ears.
It does not depend on the
sensitivity of the ears.
It’s unit is decibel (dB). Its unit is watt/m2.

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