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Q.

When an ideal diatomic gas is heated at constant pressure, the fraction of heat energy supplied which is used in doing work to maintain pressure constant is

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a

$\frac{5}{7}$

b

$\frac{7}{2}$

c

$\frac{2}{7}$

d

$\frac{2}{5}$

answer is C.

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Detailed Solution

$\frac{d W}{d Q} = 1 - \frac{1}{γ}$

as the gas is diatomic gas.

$γ = \frac{7}{5} \Rightarrow \frac{d W}{d Q} = \frac{2}{7}$

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