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Question 19M.3.SL.TZ2.13bii

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.SL.TZ2.13bii
Level SL Paper 3 Time zone TZ2
Command term Calculate Question number bii Adapted from N/A
bii.
[Maximum mark: 1]
19M.3.SL.TZ2.13bii

The following data are available for the Cepheid variable δ-Cephei.

Peak luminosity = 7.70 × 1029 W

Distance from Earth = 273 pc

Peak wavelength of light = 4.29 × 10–7 m

(bii)

Calculate the peak surface temperature of δ-Cephei.

[1]

Markscheme

« T = 2.9 × 10 − 3 4.29 × 10 − 7 »

=6800«K»  ✔

Examiners report

This simple calculation using Wien’s law was very well answered.

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