The density of a gas filled electric lamp is `0.75 kg"/"m^(3)`. After the lamp has been switched on, the pressure in it increases from `4 xx 10^(4)Pa` to `9 xx 10^(4)Pa`. What is increase in `U_(RMS)`?

Options

A. `100`
B. `200`
C. `300`
D. `400`

Answer

B

Explanation

`U_(1) = sqrt((3P_1)/(d_1))" "therefore triangleU_(rms)= sqrt((3)/(d))(sqrt(P_2)-sqrt(P_1))= sqrt((3)/(0.75))(300-200)= sqrt(4)xx 100= 200`.