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Question

A system undergoes a process in which system releases 200 J heat and work done by the surroundings is 300 J. Change in internal energy of the system is

A

−100 J

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B

100 J

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C

−500 J

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D

500 J

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Solution

The correct option is B

100 J


ΔU = q + w
Since system releases heat, q will be negative. It is also given that work done by the surroundings is 300 J which is the same as the work done on the system. Hence, w has a +ve sign. Keeping this in mind, we get:

= 200 + 300 = 100 J


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