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At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from
\( \mathrm{P} \) the Earth's atmosphere?

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(Given: Mass of oxygen molecule \( (m)=2.76 \times 10^{-26} \mathrm{~kg} \),
Boltzmann's constant \( k_{B}=1.38 \times 10^{-23} \mathrm{~J} \mathrm{~K}^{-1} \) )
(a) \( 2.508 \times 10^{4} \mathrm{~K} \)
(b) \( 8.360 \times 10^{4} \mathrm{~K} \)
(c) \( 5.016 \times 10^{4} \mathrm{~K} \)
(d) \( 1.254 \times 10^{4} \mathrm{~K} \)
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