21 ollection of n two-level systems with energies 0 $7 7. a de>0 is in the thermal equilibrium at temperature t for t o, the specific heat approaches (a) 0 (c)

21 ollection of N two-level systems with energies 0 $7 7. A dE>0 is in the thermal equilibrium at temperature T For T o, the specific heat approaches (a) 0 (c) 3Nk/2 (b) Nk, (d) o A JEST-2012