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Heat and Thermodynamics question

2025 · 23 Jan · Shift 1 · Q75
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Heat and Thermodynamics question

2025 · 23 Jan · Shift 1 · Q75

JEE MainPhysicsHeat and ThermodynamicsNumerical+4 / −1
An ideal gas initially at 0∘C0^{\circ} \mathrm{C}0∘C temperature, is compressed suddenly to one fourth of its volume. If the ratio of specific heat at constant pressure to that at constant volume is 3/23 / 23/2, the change in temperature due to the thermodynamic process is ‾\underline{\hspace{2cm}}​ K.
Numerical answer
View written solutionFree

Correct answer: 273

  1. Given data
  • Initial temperature: T1=0∘C=273 KT_1 = 0^\circ C = 273\,\text{K}T1​=0∘C=273K
  • Final volume: gas is compressed to one fourth of initial volume V2=V14V_2 = \frac{V_1}{4}V2​=4V1​​
  • Ratio of specific heats: γ=CpCv=32\gamma = \frac{C_p}{C_v} = \frac{3}{2}γ=Cv​Cp​​=23​

Because the gas is compressed suddenly, the process is taken as adiabatic.


  1. Use adiabatic relation

For an ideal gas in an adiabatic process, TVγ−1=constantT V^{\gamma-1} = \text{constant}TVγ−1=constant

So, T1V1γ−1=T2V2γ−1T_1 V_1^{\gamma-1} = T_2 V_2^{\gamma-1}T1​V1γ−1​=T2​V2γ−1​

Hence, T2T1=(V1V2)γ−1\frac{T_2}{T_1} = \left(\frac{V_1}{V_2}\right)^{\gamma-1}T1​T2​​=(V2​V1​​)γ−1

Substitute V2=V1/4V_2 = V_1/4V2​=V1​/4 and γ−1=32−1=12\gamma - 1 = \frac{3}{2}-1 = \frac{1}{2}γ−1=23​−1=21​:

T2T1=(V1V1/4)1/2=41/2=2\frac{T_2}{T_1} = \left(\frac{V_1}{V_1/4}\right)^{1/2} = 4^{1/2} = 2T1​T2​​=(V1​/4V1​​)1/2=41/2=2

Therefore, T2=2T1=2×273=546 KT_2 = 2T_1 = 2 \times 273 = 546\,\text{K}T2​=2T1​=2×273=546K


  1. Find change in temperature

ΔT=T2−T1=546−273=273 K\Delta T = T_2 - T_1 = 546 - 273 = 273\,\text{K}ΔT=T2​−T1​=546−273=273K


  1. Final answer

The change in temperature is: 273 K\boxed{273\,\text{K}}273K​


  1. Comparison with stored answer

Stored correct answer: 273273273

Our derived answer is also 273273273, so they agree.

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