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Heat energy of 735 \mathrm{~J} is given to a diatomic gas allowing the gas to expand at constant pressure. Each gas molecule rotates around an internal axis but do not oscillate. The increase in the internal energy of the gas will be :

Option: 1

525 \mathrm{~J}


Option: 2

441 \mathrm{~J}


Option: 3

572 \mathrm{~J}


Option: 4

735 \mathrm{~J}


Answers (1)

best_answer

At constant Pressure,

\mathrm{Q}=\mathrm{nCpdT}=$ 735 $\mathrm{J}
\Delta \mathrm{U}=\mathrm{nCvd} \mathrm{T}=\frac{735}{(\mathrm{Cp} / \mathrm{Cv})}=\frac{735}{\gamma}
\Delta \mathrm{U}=\frac{735}{(7 / 5)}=525 \mathrm{~J}

Posted by

vishal kumar

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