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Venus' exosphere has a temperature of about 459 K. What is the thermal speed of hydrogen...

Venus' exosphere has a temperature of about 459 K. What is the thermal speed of hydrogen (in km/s) in Venus' exosphere? The mass of a hydrogen atom is 1.67 x 10-27 kg and Boltzmann's constant is k = 1.38 × 10-23 Joule/Kelvin.

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