Let k be the Boltzmann constant. If the thermodynamic state of a gas at temperature T changes isothermally and reversibly to a state with three times the number of microstates as initially, the energy input to the gas as heat is:

A. Q = 0
B. Q = 3kT
C. Q = ?3kT
D. kT ln 3
E. ?kT ln 3


Answer: D. kT ln 3

Physics & Space Science

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