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Question 18N.2.HL.TZ0.8c.iii

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Date November 2018 Marks available [Maximum mark: 3] Reference code 18N.2.HL.TZ0.8c.iii
Level HL Paper 2 Time zone TZ0
Command term Outline Question number c.iii Adapted from N/A
c.iii.
[Maximum mark: 3]
18N.2.HL.TZ0.8c.iii

There is a proposal to place a satellite in orbit around planet Mars.

The ratio  distance of Mars from the Sun distance of Earth from the Sun = 1.5.

(c.iii)

The atmosphere of Mars is composed mainly of carbon dioxide and has a pressure less than 1 % of that on the Earth. Outline why the mean temperature of Earth is strongly affected by gases in its atmosphere but that of Mars is not.

[3]

Markscheme

reference to greenhouse gas/effect ✔

recognize the link between molecular density/concentration and pressure ✔

low pressure means too few molecules to produce a significant heating effect

OR

low pressure means too little radiation re-radiated back to Mars ✔

 

The greenhouse effect can be described, it doesn’t have to be named

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