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Question 17N.2.SL.TZ0.5b.i

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.2.SL.TZ0.5b.i
Level SL Paper 2 Time zone TZ0
Command term Determine Question number b.i Adapted from N/A
b.i.
[Maximum mark: 2]
17N.2.SL.TZ0.5b.i

A satellite powered by solar cells directed towards the Sun is in a polar orbit about the Earth.

The satellite is orbiting the Earth at a distance of 6600 km from the centre of the Earth.

The satellite carries an experiment that measures the peak wavelength emitted by different objects. The Sun emits radiation that has a peak wavelength λS of 509 nm. The peak wavelength λE of the radiation emitted by the Earth is 10.1 μm.

(b.i)

Determine the mean temperature of the Earth.

[2]

Markscheme

T = « 2.90 × 10 − 3 λ max = »  2.90 × 10 − 3 10.1 × 10 − 6

= 287 «K» or 14 «°C»

Award [0] for any use of wavelength from Sun

Do not accept 287 °C

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