DP Physics (last assessment 2024)

Question 18M.3.SL.TZ2.11c.ii

Date	May 2018	Marks available	[Maximum mark: 1]	Reference code	18M.3.SL.TZ2.11c.ii
Level	SL	Paper	3	Time zone	TZ2
Command term	Outline	Question number	c.ii	Adapted from	N/A

c.ii.

[Maximum mark: 1]

18M.3.SL.TZ2.11c.ii

The following data apply to the star Gacrux.

$\begin{array}{*{20}{l}} {{\text{Radius}}}&{ = 58.5 \times {{10}^9}{\text{ m}}} \\ {{\text{Temperature}}}&{ = 3600{\text{ K}}} \\ {{\text{Distance}}}&{ = 88{\text{ ly}}} \end{array}$

(c.ii)

The distance to Gacrux can be determined using stellar parallax. Outline why this method is not suitable for all stars.

[1]

Markscheme

if the star is too far then the parallax angle is too small to be measured

stellar parallax is limited to closer stars

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[1 mark]

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Option D: Astrophysics

Option D: Astrophysics » Option D: Astrophysics (Core topics) » D.1 – Stellar quantities

Option D: Astrophysics » Option D: Astrophysics (Core topics)

Question 18M.3.SL.TZ2.11c.ii

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