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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 :-

  1. A Diatomic only
  2. B Polyatomic only
  3. C Either monoatomic or diatomic
  4. D Monoatomic only
Verified Solution

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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