cp&cv are specific heats at constant pressure and volume respectively. It is observed that cP−cV=a for hydrogen gas cP−cV=b for nitrogen gas. The correct relation between a & b is

CP−CV=R, where CP and CV are molar specific heat capacities. given cp,cv are specific heatscp-cv=RMolecular weightmolecular weight of hydrogen =2 and nitrogen=28 As per the question, a =R2;      b=R28⇒ 2a=28ba=14b