At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the earths atmosphere given mass of oxygen?

The molecules of a given mass of a gas have rms velocity of 200 ms-1 at 27°C and 1.0×105N m-2 pressure. When the temperature and pressure of the gas are, respectively, 127°C and 0.05×105 M m-2, the rms velocity of its molecules in m s-1 is

1. 10023

2. 1003

3. 1002

4. 4003

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