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At what temperature will the rms speed o...

At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth's atmsphere? [ Given, mass of oxygen molecule (m) = `2.76xx10^(-26)` kg, Boltzmann's constant `k_(B) = 1.38 xx 10^(-23) Jcdot K^(-1)` ]

A

`5.016 xx 10^(4)` K

B

`8.360 xx 10^(4)` K

C

`2.508 xx 10^(4)` K

D

`1.254 xx 10^(4)` K

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