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11. thermodynamics — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics11. thermodynamics1 Mark
MCQ
Two samples $A$ and $B$ of a gas initially at the same pressure and temperature are compressed from volume $ V$ to $ V/2$ ($A$ isothermally and adiabatically). The final pressure of $ A$ is
  • A
    Greater than the final pressure of $ B$
  • B
    Equal to the final pressure of $ B$
  • ✓
    Less than the final pressure of $B$
  • D
    Twice the final pressure of $ B$
✓

Answer

Correct option: C.
Less than the final pressure of $B$
c
(c)$A$ is compressed isothermally, hence
${P_1}V = {P_2}\frac{V}{2} \Rightarrow {P_2} = 2{P_1}$
and $B$ is compressed adiabatically, hence
${P_1}{V^\gamma } = {P_2}\,{\left( {\frac{V}{2}} \right)^\gamma } \Rightarrow {P_2} = {(2)^\gamma }{P_1}$
Since $\gamma > 1$, hence ${P_2}' > {P_2}$or ${P_2} < {P'_2}$

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