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At what temperature will the rms s...

At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth's atmmosphere ? [ given . Mass of oxygen molecules `( m ) = 2.76 xx 10 ^(-26) ` kg , Boltzman's constant `K_(B ) = 1.38 xx 10 ^(-23) J * 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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