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Question 21M.2.SL.TZ1.4a.i

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Date May 2021 Marks available [Maximum mark: 2] Reference code 21M.2.SL.TZ1.4a.i
Level SL Paper 2 Time zone TZ1
Command term Explain Question number a.i Adapted from N/A
a.i.
[Maximum mark: 2]
21M.2.SL.TZ1.4a.i

A planet orbits at a distance d from a star. The power emitted by the star is P. The total surface area of the planet is A.

(a.i)

Explain why the power incident on the planet is

                                                                P4πd2×A4.

[2]

Markscheme

P4πd2 is the power received by the planet/at a distance d «from star» ✓

A4 is the projected area/cross sectional area of the planet ✓

 

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