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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 presure in it increases from `4 xx 10^4` Pa t `9 xx 10^4` 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
(b) `U_(1)=sqrt((3P_(1))/(d_(1)))`
`:. /_\U_("rms")=sqrt((3)/(d))(sqrt(P_(2))-sqrt(P_(1)))`
`=sqrt((3)/(0.75))(300-200)`
`=sqrt(4)xx100=200`
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