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JEE Main levelNumerical answerDifficulty 2 of 3ig140

The rms speed of $He$ atoms (molar mass $4 g mo l^{- 1}$ ) at $300 K$ , taking $R = 8.314 J K^{- 1} mo l^{- 1}$ , in $m s^{- 1}$ (nearest integer) is

Numerical answer type, answer in m/s, tolerance 2.

Answer: 1368 m/s

u_{rms} = \frac{3 \times 8.314 \times 300}{0.004} = 1870650 = 1367.7 \approx 1368 m s^{- 1}

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