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Question

First law of thermodynamics can be represented by ΔU = q + w.

A
True
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B
False
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Solution

The correct option is A True

True. Let us consider a system whose internal energy is U1. Now if we add q heat to the system the internal energy becomes U1 + q. Further if w work is done on the system then the final internal energy U2 is given as U2 = U1 + q + w. Therefore the first law of thermodynamics can be represented by ΔU = q + w.

Where when q is positive, it is the heat added to the system.

when q is negative, it is the heat taken from the system.

When w is positive, it is the work done on the system.

When w is negative, it is the work done by the system.


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