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Question

A certain amount of an ideal gas is initially at a pressure p1and temperature T1. First, it undergoes a constant pressure process 1-2 such that T2=3T1/4. Then, it undergoes a constant volume process 2-3 such that T3=T1/2. The ratio of the final volume to the initial volume of the ideal gas is

A
0.25
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B
0.75
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C
1.0
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D
1.5
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Solution

The correct option is B 0.75


Process 1 - 2: At p=C

T2=3T14. (given condition)

(or). T2T1=34

According to Charles's law

V2V1 = T2T1=34

Process 2 - 3: At V = C

T3=T12 given condition

FinalvolumeInitialvolume = V3V1=V2V1 = T2T1 V3=V2

= 34=0.75

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