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MHT CET 202623 AprilEvening Shift
Exam
MHT CET
Year
2026
Date
23 April
Shift
Evening Shift
Subject
Physics
Chapter
Thermodynamics

MHT CET 2026 · 23 April · Evening Shift · Physics · Thermodynamics

A rigid diatomic ideal gas is compressed adiabatically to (1/32) of...

A rigid diatomic ideal gas is compressed adiabatically to (1/32)(1/32) of its initial volume. If the initial temperature of the gas is T1T_1 (in kelvin) and the final temperature is "nT1nT_1", the value of n is {γ=1.4}\{\gamma= 1.4\}

Options

  1. A11
  2. B22
  3. C33
  4. D44

Correct answer

D. 44

Step-by-step solution

For an adiabatic process, the relation between temperature and volume is given by:

T1V1γ−1=T2V2γ−1T_1 V_1^{\gamma - 1} = T_2 V_2^{\gamma - 1}

Given that V2=V132V_2 = \dfrac{V_1}{32}, T2=nT1T_2 = nT_1, and γ=1.4\gamma = 1.4, we can substitute these values into the equation:

T1V11.4−1=nT1(V132)1.4−1T_1 V_1^{1.4 - 1} = nT_1 \left(\dfrac{V_1}{32}\right)^{1.4 - 1}

V10.4=n(V132)0.4V_1^{0.4} = n \left(\dfrac{V_1}{32}\right)^{0.4}

1=n(132)0.41 = n \left(\dfrac{1}{32}\right)^{0.4}

n=(32)0.4n = (32)^{0.4}

Since 0.4=250.4 = \dfrac{2}{5} and 32=2532 = 2^5, we have:

n=(25)25=22=4n = (2^5)^{\dfrac{2}{5}} = 2^2 = 4

Answer: 44
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