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Question 20N.3.SL.TZ0.4b(i)

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.3.SL.TZ0.4b(i)
Level SL Paper 3 Time zone TZ0
Command term Deduce Question number b(i) Adapted from N/A
b(i).
[Maximum mark: 2]
20N.3.SL.TZ0.4b(i)

A spaceship is travelling at 0.80c, away from Earth. It launches a probe away from Earth, at 0.50c relative to the spaceship. An observer on the probe measures the length of the probe to be 8.0 m.

(b(i))

Deduce the length of the probe as measured by an observer in the spaceship.

[2]

Markscheme

γ=1.15 ✓

length = 6.9 «m» ✓

 

Allow length in the range 6.7 to 7.0 m.

Allow ECF from wrong γ

Award [2] marks for a bald correct answer in the range indicated above.

Examiners report

Very well answered.

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