Question

In an isobaric process, the ratio of heat supplied to the system (dQ) and work done by the system (dW) for diatomic gas is

• A. 1 : 1
• B. 7 : 2
• C. 7 : 5
• D. 5 : 7

Answer 1

The correct option is B

7 : 2

$-\frac{dQ}{dW}=\frac{dQ}{dQ-dE}$; $dE=dW+dQ;$

$-dW=dQ-dE$

$=\frac{n{c}_{p}dT}{n{c}_{p}dT-n{c}_{v}dT}=\frac{c_p}{c_p-c_v}$

$=\frac{7R}{2R}(fordiatomicofcas{c}_p=\frac{7R}{2})$ , $c_P-c_V=R$