NEET-XII-Physics
26: Laws of Thermodynamics
- #12When we heat an object, it expands. Is work done by the object in this process? Is heat given to the object equal to the increase in its internal energy?Ans : When we heat an object, it expands, i.e. its volume increases.
Work done by the system, `` \Delta W=P\Delta V``
Using the first law of thermodynamics, we get
`` ∆``Q = `` ∆U+∆W``
Since the volume changes,`` ∆``W has some non-zero positive value. Thus, heat given to the object is not equal to the increase in the internal energy of the system.
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