JEE MAIN - Physics (2016 - 9th April Morning Slot - No. 17)

The ratio of work done by an ideal monoatomic gas to the heat supplied to it in an isobaric process is :
$${3 \over 5}$$
$${2 \over 3}$$
$${3 \over 2}$$
$${2 \over 5}$$

Explanation

In an isobaric process,

Heat supplied, Q = n Cp $$\Delta $$ T

Work done, w = nR$$\Delta $$T

$$ \therefore $$   Ratio = $${w \over Q}$$ = $${{nR\Delta T} \over {n{C_p}\Delta T}}$$

=   $${R \over {{5 \over 2}R}}$$

=   $${2 \over 5}$$

[Cp = $${5 \over 2}$$ R for monoatomic gas]

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