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Question 20N.3.HL.TZ0.21a

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.3.HL.TZ0.21a
Level HL Paper 3 Time zone TZ0
Command term Calculate Question number a Adapted from N/A
a.
[Maximum mark: 1]
20N.3.HL.TZ0.21a
(a)

The light from a distant galaxy shows that z=0.11.

Calculate the ratio size of the universe when the light was emittedsize of the universe at present.

[1]

Markscheme

«R0R=»

11.11  OR  0.90  OR  90% ✓

 

Examiners report

Many candidates got the ratio upside down and ended up with R/R0 as 1.11.


This was not accepted as it would have required an identification of the variables. Perhaps candidates need to look more carefully at which R is which here. R is the current value of the scale factor in the data book, so R0/R = 0.9 was required.

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