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JEE Main 202125 FebruaryEvening Shift
Exam
JEE Main
Year
2021
Date
25 February
Shift
Evening Shift
Subject
Physics
Chapter
Kinetic Theory of Gases

JEE Main 2021 · 25 February · Evening Shift · Physics · Kinetic Theory of Gases

Given below are two statements: Statement I: In a diatomic...

Given below are two statements:

Statement I: In a diatomic molecule, the rotational energy at a given temperature obeys Maxwell's distribution.

Statement II : In a diatomic molecule, the rotational energy at a given temperature equals the translational kinetic energy for each molecule.

In the light of the above statements, choose the correct answer from the options given below:

Options

  1. AStatement II is false but Statement IIII is true.
  2. BStatement II is true but Statement IIII is false.
  3. CBoth Statement II and Statement IIII are true.
  4. DBoth Statement II and Statement IIII are false.

Correct answer

B. Statement II is true but Statement IIII is false.

Step-by-step solution

The translational kinetic energy & rotational kinetic energy both obey Maxwell's distribution
independent of each other.
Translational kinetic energy of diatomic molecules =32kT= \dfrac{3}{2}kT
Rotational kinetic energy of diatomic molecules =22kT= \dfrac{2}{2}kT
So statement I is true but statement II is false.
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