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Question 18M.3.SL.TZ1.11b.iii

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.SL.TZ1.11b.iii
Level SL Paper 3 Time zone TZ1
Command term Estimate Question number b.iii Adapted from N/A
b.iii.
[Maximum mark: 2]
18M.3.SL.TZ1.11b.iii

The graph shows the observed spectrum from star X.

M18/4/PHYSI/SP3/ENG/TZ1/11_01

The second graph shows the hydrogen emission spectrum in the visible range.

M18/4/PHYSI/SP3/ENG/TZ1/11_02

The following diagram shows the main sequence.

M18/4/PHYSI/SP3/ENG/TZ1/11.b

(b.iii)

Estimate the mass of star X (MX) in terms of the mass of the Sun (Ms).

[2]

Markscheme

MX = ( 35 ) 1 3.5 Ms

MX = 2.8Ms

 

Allow ECF from (b)(i).

Do not accept MX = (35) 1 3.5 for first marking point.

Accept values in the range: 2.6 to 2.9Ms.

[2 marks]

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