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Standard XII

Physics

Thermodynamic Processes

When a system...

Question

When a system is taken from state i to state f along the path iaf, it is found that $Q = 50 c a l$ and $W = 20 c a l$ . Along the path ibf, $Q = 36 c a l$ , W along the path $^{'} i b f^{'}$ is :

6 c a l

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16 c a l

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66 c a l

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14 c a l

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Solution

The correct option is A $6 c a l$
By first law of thermodynamics :
$Q = Δ U + W$

In path iaf:
$50 = Δ U + 20 ∴ Δ U = 30$
As this change in internal energy is between i & f and does not depend on path.

Therefore along path ibf:
$Q = Δ U + W 36 = 30 + W ∴ W = 6 c a l$

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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 :

The correct option is A 6 cal By first law of thermodynamics :Q=ΔU+WIn path iaf:50=ΔU+20∴ΔU=30As this change in internal energy is between i & f and does not depend on path. Therefore along path ibf:Q=ΔU+W36=30+W∴W=6 cal

When a system is taken from state i to state f along the path iaf, it is found that $Q = 50 c a l$ and $W = 20 c a l$ . Along the path ibf, $Q = 36 c a l$ , W along the path $^{'} i b f^{'}$ is :

The correct option is A $6 c a l$
By first law of thermodynamics :
$Q = Δ U + W$

In path iaf:
$50 = Δ U + 20 ∴ Δ U = 30$
As this change in internal energy is between i & f and does not depend on path.

Therefore along path ibf:
$Q = Δ U + W 36 = 30 + W ∴ W = 6 c a l$