At a distance of 15.0 m from a sound source, the intensity level is 60.0 dB. What is the intensity level (in decibels) at a point 2.00 m from the source if the source radiates equally in all directions?

a) 77.5 dB
b) 57.5 dB
c) 75.5 dB
d) 55.7 dB

The intensity level is 77.5 dB.

(a) is correct option.

Explanation:

Given that,

Distance

Distance

Intensity level = 60.0 dB

We know that,

Here, Intensity is inversely proportional to the square of the distance.

We need to calculate the intensity level

Using formula of intensity level

Now,

Put the value of intensity

Hence, The intensity level is 77.5 dB.

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

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