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JEE Main 7-April-2025 Paper - Shift 2 — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEEJEE Main 7-April-2025 Paper - Shift 24 Marks
MCQ
The helium and argon are put in the flask at the same room temperature ( 300 K ). The ratio of average kinetic energies (per molecule) of helium and argon is :
(Give : Molar mass of helium $=4 \mathrm{~g} / \mathrm{mol}$, Molar mass of argon $=40 \mathrm{~g} / \mathrm{mol}$ )
  • A
    $1: 10$
  • B
    $10: 1$
  • C
    $1: \sqrt{10}$
  • D
    $1: 1$
✓

Answer

D. $1: 1$
$\quad \mathrm{K} . \mathrm{E}=\frac{\mathrm{f}}{2} \mathrm{KT}$
For He and $\mathrm{Ar} \mathrm{f}=3$
$\frac{\mathrm{K} \cdot \mathrm{E}_{\mathrm{He}}}{\mathrm{K} \cdot \mathrm{E}_{\mathrm{Ar}}}=\frac{1}{1}$

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