Question

When an ideal diatomic gas is heated at constant pressure the fraction of the heat energy supplied which increases the internal energy of the gas is .
A. `(2)/(5)`
B. `(3)/(5)`
C. `(3)/(7)`
D. `(5)/(7)`

Answer 1

`C_(p) =C_(v) + w, w =R`
and `C_(v) = (3)/(2) R +R = (5)/(2) R` for diatomic gas
Thus `(5)/(2) R` factor of `C_(p)((7)/(2)R)` is used in increasing internal energy or heat supplied to increase
internal energy of gas at constnat `P` is `(5//2R)/(7//2R)= (5)/(7) . ` .