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The temperature, at which the root mean square velocity of hydrogen molecules equals their escape velocity from the earth, is closest to – [Boltzmann Constant k B = 1.38 × 10 –23 J/K ; Avogadro Number N A = 6.02 × 10 26 / kg; Radius of Earth : 6.4 × 10 6 m; Gravitational acceleration on earth = 10 ms –2 ]

1. 650 K
2. 3 × 10 5 K
3. 800 K
4. 10 4 K

Correct answer: 10 4 K

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