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Question

One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure. The change in internal energy of the gas during the transition is:


A
12 kJ
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B
12 kJ
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C
20 kJ
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D
20 kJ
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Solution

The correct option is D 20 kJ
The change in internal energy for diatomic gas is given by,

ΔU=nCVΔT=nCV(TBTA)

n no of mole, Here n=1
CV Specific heat capacity at constant volume
ΔT change in temperature

For a diatomic gas, CV=52R

From ideal gas equation, PV=nRT

TA=PAVAR; TB=PBVBR

ΔU=1×52×R×(PBVBRPAVAR)

ΔU=52(PBVBPAVA)

From the given graph,
PA=5×103 Pa ; VA=4 m3
PB=2×103 Pa ; VB=6 m3

ΔU=52[(2×103×6)(5×103×4)]

ΔU=20 kJ

Hence, option (D) is correct.

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