DP Physics (first assessment 2025)

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Question 21N.2.SL.TZ0.a.ii

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Date November 2021 Marks available [Maximum mark: 3] Reference code 21N.2.SL.TZ0.a.ii
Level SL Paper 2 Time zone TZ0
Command term Explain Question number a.ii Adapted from N/A
a.ii.
[Maximum mark: 3]
21N.2.SL.TZ0.a.ii

Titan has an atmosphere of nitrogen. The albedo of the atmosphere is 0.22. The surface of Titan may be assumed to be a black body. Explain why the average intensity of solar radiation absorbed by the whole surface of Titan is 3.1 W m−2

[3]

Markscheme

exposed surface is ¼ of the total surface ✓

absorbed intensity = (1−0.22) × incident intensity ✓

0.78 × 0.25 × 15.7  OR  3.07 «W m−2» ✓

 

Allow 3.06 from rounding and 3.12 if they use 16 W m−2.

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