Assetion : Specific heat of a gas at constant pressure is greater than its specific heat at constant volume.
This is because at constant pressure, some heat is spent in expansion of the gas.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer

A

Explanation

`C_v` is used in increasing the internal energy of the gas while `C_P` is used in two ways (i) to change the internal energy and (ii) to do expansion of gas. Hence `C_P gt C_V`.