The Student Room Group
Reply 1
sunnyguha
Only giant planets have Hydrogen in their atmosphere becoz

a - this gas was present only near these planets during the formation of solar system
b-of their large gravitational pull
c-they produce hrdrogen constantly

which is the correct answer??

Only b makes sense to me. a and c seems made up.
Reply 2
B is the correct answer. The kinetic energy of hydrogen at typical planet surface temperatures is often greater than its GPE, thus it leaves the planet. So you require a greater 'gravitational pull' in order to increase the GPE and keep the hydrogen on the planet.
Reply 3
Yep, B - Worzo has (of course) got it totally right. :smile:

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