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In an isothermal expansion, heat supplied equals the:
AWeight gained
BWave energy
CWall pressure
DWork done
Answer & Solution
Correct answer: D. Work done
1. Internal energy does not change.
2. The first law then simplifies.
3. Heat supplied equals the work done by the gas.
_Source: NCERT Class 11 Physics, Ch 11 'Thermodynamics'_
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