## Answers

Intensity level = 10 log(I/Io), where I is intesity and Io=10^-12 W/m2

Initially, let the intensity be i.Also, initial intensity level = 60 dB.

So, 60=10log(i/Io)............eqn 1

Let there be n viewers. So, final intensity = n*i. Also , final intensity level = 110 dB.

So, 110=10log(n*i/Io)

=>110 = 10 log n + 10 log(i/Io)

=>110=10log n + 60 (using eqn 1)

=>10 log n = 50

=>log n =5

=>n=10^5 = 100000

So, required number of viewers= 100000

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