How does the intensity of a sound wave change if the distance from the
source is increased by a factor of 4?
A. The intensity decreases by a factor of 4.
B. The intensity increases to by a factor of 16.
c. The intensity decreases by a factor of 16.
D. The intensity increases by a factor of 4.

The new intensity decreases by a factor of 16.

Explanation:

The intensity of sound wave is given by :

P is power

A is area

or

, r is distance from the source

If the distance from the  source is increased by a factor of 4, r' = 4r

So,

So, the new intensity decreases by a factor of 16.

a) are muscles that have bands.

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