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JEE Main 202117 MarchEvening Shift
Exam
JEE Main
Year
2021
Date
17 March
Shift
Evening Shift
Subject
Physics
Chapter
Kinetic Theory of Gases

JEE Main 2021 · 17 March · Evening Shift · Physics · Kinetic Theory of Gases

If one mole of the polyatomic gas is having two vibrational modes...

If one mole of the polyatomic gas is having two vibrational modes and β\beta is the ratio of molar specific heats for polyatomic gas (β=CPCv)\left(\beta = \dfrac{{C}_{P}}{{C}_{v}}\right) then the value of β\beta is :

Options

  1. A1.021 . 02
  2. B1.21 . 2
  3. C1.251 . 25
  4. D1.351 . 35

Correct answer

B. 1.21 . 2

Step-by-step solution

f=4+3+3=10f = 4 + 3 + 3 = 10, assuming non-linear,

β=CpCv=1+2f=1210=1.2\beta = \dfrac{{C}_{p}}{{C}_{v}} = 1 + \dfrac{2}{f} = \dfrac{12}{10} = 1 . 2

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