The specific heat at constant pressure is greater than that for the same gas at constant volume because

Options

A. At constant pressure work is done in expanding the gas
B. At constant volume work is done in expanding the gas
C. The molecular attraction increases more at constant pressure
D. The molecular vibration increases more at constant pressure

Answer

A

Explanation

As P = constant
`C_P=(DeltaQ)/(DeltaT)=(DeltaU)/(DeltaT)+(DeltaW)/(T)`
and for `C_V=`, V= constant
`C_V=(DeltaQ)/(DeltaT)=(DeltaU)/(DeltaT)`
Hence, `C_P gt C_V`