When a system is taken from state i to a state f along path iaf, ,Q = 50,J and W = 20J. Along path i

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11.Thermodynamics

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When a system is taken from state $i$ to a state $f$ along path $iaf, \,Q = 50\,J$ and $W = 20J.$ Along path $ibf, \,Q = 35J.$ If $W = - 13J$ for the curved return path $f i, Q$ for this path is ...... $J$

A

$33 $

B

$23 $

C

$-7 $

D

$-43 $

Solution

(d) $\Delta U$, remains same for both path

For path $iaf : \Delta U = \Delta Q – \Delta W = 50 – 20 = 30J$.

For path $fi : \Delta U = – \,30\,J\,{\rm{and\, }}\Delta W = – 13J$

==> $\Delta Q = – \,30 – 13 = – \,43\;J$.

Standard 11

Physics

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