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When an ideal gas is heated at constant ...

When an ideal gas is heated at constant pressure, the fraction of the heat energy supplied whicn increases the internal energy of the gas is :

A

`(2)/(5)`

B

`(3)/(5)`

C

`(3)/(7)`

D

`(5)/(7)`

Text Solution

Verified by Experts

The correct Answer is:
D
`{:(dQ=dW+dU,,,,),(dQ=PdV+dU,,,,),(dQ=nRdT+dU,,,,):}`
`dQ=(2dU)/(f)+dU" "[dU=(nfRdT)/(2)]`
`(dU)/(dQ)=(1)/(((2)/(f)+1))`
`(dU)/(dQ)=(5)/(7)`
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