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Byju's Answer
Standard XII
Physics
Gas Pressure and Temperature
P-V diagram o...
Question
P
−
V
diagram of an ideal gas for a process
A
B
C
is as shown in the figure. Change in internal energy of the gas during the process
A
B
C
.
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Solution
Let the moles of an ideal gas be
1
and the temperature at B be
T
o
.
Thus
P
o
V
o
=
R
T
o
⟹
T
o
=
P
o
V
o
R
.......................(1)
Using ideal gas equation at A :
P
A
V
A
=
R
T
A
∴
P
o
(
3
V
o
)
=
R
T
A
⟹
T
A
=
3
T
o
(using 1)
Using ideal gas equation at C :
P
C
V
C
=
R
T
C
∴
(
3
P
o
)
V
o
=
R
T
C
⟹
T
C
=
3
T
o
(using 1)
Change in internal energy of gas during process ABC
Δ
U
A
B
C
=
C
v
(
T
C
−
T
A
)
∴
Δ
U
A
B
C
=
C
v
(
3
T
o
−
3
T
o
)
=
0
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0
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