At what temperature will the rms speed of oxygen molecules become just sufficient for escapig from the Earth's atmosphere ? <br> (Given : <br> Mass of oxygen molecule (m) = $2.76 \times 10^{-25} kg$ <br> Boltzmann's constant $(K_B) = 1.38 \times 10^{-23} JK^{-1}$ )

Question

( A ) $2.508 \times 10^4 $ K
( B ) $5.016 \times 10^4 $ K
( C ) $1.254 \times 10^4 $ K
( D ) $8.360 \times 10^4 $ K