JEE MAIN - Physics (2022 - 28th July Evening Shift - No. 21)
At a certain temperature, the degrees of freedom per molecule for gas is 8. The gas performs 150 J of work when it expands under constant pressure. The amount of heat absorbed by the gas will be _________ J.
Answer
750
Explanation
$$f = 8$$
$$W = P\,dV = 150$$
$$Q = W + \Delta U$$
$$ = P\,dV + {f \over 2}\,PdV$$
$$Q = 5 \times 150 = 750\,J$$
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