Apoint source emits sound waves of amplitude a. the sound intensity at a distance d from the
source is i. what is the sound intensity at a distance 0.5d from the source when the source emits
waves of amplitude 2a?

The sound intensity is  16I

Explanation:

Given:

Dsitance d = 0.5

Amplitude  = 2A

To Find:

sound intensity = ?

Solution:

We Know that

When Distance is d, wuth amplitude A

The sound intensity ---------------------(1)

Where

C is proportionality constant

Substituting the values

From 1 ,  

it is the second option.

the answer would be a