When a system is taken from state i to state f along path iaf , it is found that Q=50 cal and W=20 c

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11.Thermodynamics

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When a system is taken from state $i$ to state $f$ along the path $iaf$, it is found that $Q=50$ $cal$ and $W=20$ $cal$ Along the path $ibf\ Q = 36\ cal. \ W$ along the path $ibf$ is ....... $ cal$

A

$14$

B

$6$

C

$16$

D

$66 $

(AIEEE-2007)

Solution

For path iaf,$\Delta U = Q – W = 50 – 20 = 30\,cal.$

For path ibf $W = Q – \Delta U = 36 – 30 = 6\,cal.$

Standard 11

Physics

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