At a distance of 20 m from a source of sound, the sound level is 40 db. if the observer backs up to a distance of 40 m from the source, what will the sound level be? o a. 34 db o b. 28 db ° c. 20 db o d. 10 db

The sound level is 34 dB.

(A) is correct option.

Explanation:

Given that,

Distance from a source of sound

Sound level

Distance from a source of sound

We need to calculate the sound level

Using equation

Hence, The sound level is 34 dB.

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explanation:

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