Question
Physics Question on kinetic theory
At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth�s atmosphere ? (Given: Mass of oxygen molecule (m)=2.76×10−26kg Boltzmann�s constant kB=1.38×10−23JK−1)
A
1.254×104K
B
2.508×104K
C
5.016×104K
D
8.360×104K
Answer
8.360×104K
Explanation
Solution
Vescape =11200m/s
Say at temperature T it attains Vescape
So, mo23kBT=11200m/s
On solving,
T=8.360×104K