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Question 19N.3.SL.TZ0.b(i)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.SL.TZ0.b(i)
Level SL Paper 3 Time zone TZ0
Command term Show that Question number b(i) Adapted from N/A
b(i).
[Maximum mark: 2]
19N.3.SL.TZ0.b(i)

Eta Cassiopeiae A and B is a binary star system located in the constellation Cassiopeia.

The following data are available.

Apparent brightness of Eta Cassiopeiae A    = 1.1 × 10–9 Wm–2
Apparent brightness of Eta Cassiopeiae B    = 5.4 × 10–11 Wm–2
Luminosity of the Sun, L⊙                             = 3.8 × 1026 W

The peak wavelength of radiation from Eta Cassiopeiae A is 490 nm. Show that the surface temperature of Eta Cassiopeiae A is about 6000 K.

[2]

Markscheme

«T=2.9×10-3490×10-9»

5900 K ✔

NOTE: Answer 6000 K is given in the question.
Answer must be to at least 2 s.f. OR correct working.

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