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NEET UG PHYSICS MCQ: THERMODYNAMICS

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Analyzing +4 | -1
Assertion: The ratio CPCV\frac{C_P}{C_V} is more for helium gas than for hydrogen gas.
Reason: Atomic mass of helium is more than that of hydrogen.
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Correct option: B
If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
Option B is correct. The ratio CPCV\frac{C_P}{C_V} is indeed higher for helium than for hydrogen because helium is monoatomic (γ=5/3\gamma = 5/3) and hydrogen is diatomic (γ=7/5\gamma = 7/5). However, the reason given (atomic mass) is not the correct explanation; the correct reason is the difference in degrees of freedom.

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