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The temperature of 1 mole helium gas is ...

The temperature of `1` mole helium gas is increased by `1^@C`. Find the increase in internal energy.

A

2 cal

B

3 cal

C

4 cal

D

5 cal

Text Solution

Verified by Experts

The correct Answer is:
B
`C_(v) = ((DeltaU)/(DeltaT))_(V)`or` DeltaU = C_(v)DeltaT`
But for monoatomic gas,
`C_(v)= (3)/(2) R`. Also `DeltaT =1^(@)` (Given)
Hence, `DeltaU = C_(v)DeltaT = (3)/(2) R = (3)/(2) xx2 = 3 cal`
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