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Question 17N.3.SL.TZ0.11b.iii

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.3.SL.TZ0.11b.iii
Level SL Paper 3 Time zone TZ0
Command term Show that Question number b.iii Adapted from N/A
b.iii.
[Maximum mark: 2]
17N.3.SL.TZ0.11b.iii

Two of the brightest objects in the night sky are the planet Jupiter and the star Vega.
The light observed from Jupiter has a similar brightness to that received from Vega.

Vega is found in the constellation Lyra. The stellar parallax angle of Vega is about 0.13 arc sec.

(b.iii)

Show that the distance to Vega from Earth is about 25 ly.

[2]

Markscheme

1 0.13 = 7.7 «pc»

so d = 7.7 x 3.26 = 25.1 «ly»

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