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The density of a gas filled in electric ...

The density of a gas filled in electric lamp is `0.75kg//m^(3)` . After the lamp has been switched on, the pressure in it increases from `4xx10^(4)` Pa to `9xx10^(4)` Pa. What is increases in `u_("rms")` ?

A

100

B

200

C

300

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
`U_(1) = sqrt((3P_(1))/( d_(1)))`
`:. DeltaU_("rms") = sqrt((3)/( d))( sqrt( P_(2))- sqrt( P_(1)))`
`= sqrt((3)/( 0.75)) ( 300- 200)`
`= sqrt( 4) xx 100 = 200`
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