Gas in a container absorbs 300 J of heat. After this, 100 J of work is done on it which is followed by 50 J of work done by the gas. The increase in the internal energy of the gas is:
A
450 J
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B
400 J
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C
350 J
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D
200 J
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E
100 J
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Solution
The correct option is B 350 J Amount of heat absorbed Q=+300 J
Net amount of work done on the gas W=−100+50=−50 J