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The density of a gas filled electric lam...

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)`?

A

`1.00`

B

`200`

C

`300`

D

`400`

Text Solution

Verified by Experts

The correct Answer is:
B
`U_(1) = sqrt((3P_(1))/(d_(1))) therefore Delta U_("rms") = sqrt((3)/(d)) (sqrt(P_(2)) - sqrt(P_(1))) = sqrt((3)/(0.75)) (300 - 200) = sqrt4 xx 100 = 200`
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