JEE Mains · Physics · STD 11 - 12 . kinetic theory of gases
The internal energy \((U),\) pressure \((P)\) and volume \(( V )\) of an ideal gas are related as \(U =\) \(3 P V+4\). The gas is :-
- A Diatomic only
- B Polyatomic only
- C Either monoatomic or diatomic
- D Monoatomic only
Answer & Solution
Correct Answer
(B) Polyatomic only
Step-by-step Solution
Detailed explanation
\(U =3 PV +4\) \(\frac{ nf }{2} RT =3 PV +4\) \(\frac{ f }{2} PV =3 PV +4\) \(f =6+\frac{8}{ PV }\) Since degree of freedom is more than \(6\) therefore gas is polyatomic.
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