In the given graph, an ideal gas can change its state from A to C by two paths ABC or AC. Taking, the internal energy of gas at ‘A’ is 10 J, mark the CORRECT option(s)
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a
The amount of heat supplied in path AC is 200 J, then the internal energy of gas at ‘C’ is 150 J.
b
The amount of heat supplied in path AC is 200 J, then the internal energy of gas at ‘C’ is 75 J.
c
If the internal energy of gas at state B is 20 J. Then the amount of heat supplied to the gas to go from A to B may be 5 Joule.
d
If the internal energy of gas at state B is 20 J. Then the amount of heat supplied to the gas to go from A to B must be 10 Joule.
answer is A.
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Detailed Solution
In path A→CW=4×10+12×10×4=40+20=60 J Q=ΔU+W 200=UC−UA+60 UC=140+UA=140+10=150 JIn path A→BQAB=UB−UA =UB1−UAUB=UB1−TATB =201−12=10 Joule