Discussion
Which comparison holds between the Martian and terrestrial scale heights?
Answer: B
Martian gravity is only about 3.7 metres per second squared against 9.8 on Earth, and although the temperature is lower and the molecular mass higher, the reduced gravity dominates and gives a scale height near 11 kilometres. The total amount of atmosphere does not enter the scale height at all, which is the point the question tests. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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