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A 3D cavity of volume V filled with radiation is in thermal equilibrium at temperature T. If the number of photons inside the cavity

A 3D cavity of volume V filled with radiation is in thermal equilibrium at temperature T. If the number of photons inside the cavity is doubled without changing volume of cavity, then Helmholtz free energy would be douled Gibb's free energy would be doubled specific heat at constant volume becomes halved Helmholtz free energy remains unchanged

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