`C_(p)` is always greater than `C_(v)` for a gas. Which of the following statements provide, partly or wholly, the reason for this?
a) No work is done by a gas at constant volume
b) When a gas absorbs heat at constant pressure, its volume must change
c) For the same change in temperature, the interal energy of a gas changes by a smallar amount at constant volume than at constant pressure
d) The internal energy of an ideal gas is a function only of its temperature

Options

A. only a,b are correct
B. only b, d are correct
C. only c, d are correct
D. all are correct

Answer

D