The temperature, at which the root mean square velocity of hydrogen molecules equals their escape velocity from the earth, is closest to :
[Boltzmann Constant kᵦ=1.38×10⁻²³J/K Avogadro Number Nₐ=6.02×10²⁶/kg Radius of Earth : 6.4×106m Gravitational acceleration on Earth = 10ms⁻²]
a. 650K
b. 3×10⁵K
c. 10⁴K
d. 800K