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Date November 2018 Marks available 2 Reference code 18N.2.SL.TZ0.6
Level Standard level Paper Paper 2 Time zone 0 - no time zone
Command term Show that Question number 6 Adapted from N/A

Question

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

Show that the intensity of solar radiation at the orbit of Mars is about 600 W m–2.

[2]
a.

Determine, in K, the mean surface temperature of Mars. Assume that Mars acts as a black body.

[2]
b.

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 greenhouse effect is not significant on Mars.

[2]
c.

Markscheme

use of I1r2 «1.36 × 103 × 11.52» ✔

604 «W m–2» ✔

a.

use of 6004 for mean intensity ✔

temperature/K = «6004×5.67×1084=» 230 ✔

b.

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 ✔

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Core » Topic 8: Energy production » 8.2 – Thermal energy transfer
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