At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth's atmosphere? (Given : Mass of oxygen molecule (m) = 2.76 10 -26 kg Boltzmann's constant k B = 1.38 10 -23 JK -1 )

1. A. 5.016 10 4 K
2. B. 8.360 10 4 K
3. C. 2.508 10 4 K
4. D. 1.254 10 4 K

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