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Question 17N.3.SL.TZ0.d.i

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.3.SL.TZ0.d.i
Level SL Paper 3 Time zone TZ0
Command term Determine Question number d.i Adapted from N/A
d.i.
[Maximum mark: 2]
17N.3.SL.TZ0.d.i

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

The Sun’s surface temperature is about 5800 K.

Determine the radius of Sirius B in terms of the radius of the Sun.

[2]

Markscheme

( L Sirius B L Sun ) = 0.025

r Sirius = « 0.025 × ( 5800 25000 ) 4 =» 0.0085 r Sun

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