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Question 17N.3.SL.TZ0.b

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.3.SL.TZ0.b
Level SL Paper 3 Time zone TZ0
Command term Show that Question number b Adapted from N/A
b.
[Maximum mark: 1]
17N.3.SL.TZ0.b

Sirius is a binary star. It is composed of two stars, Sirius A and Sirius B. Sirius A is a main sequence star.

The peak spectral line of Sirius B has a measured wavelength of 115 nm. Show that the surface temperature of Sirius B is about 25 000 K.

[1]

Markscheme

« λ x T = 2.9 x 10–3»

T =  2.9 × 10 − 3 115 × 10 − 9 = 25217 «K»

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