DP Physics (last assessment 2024)

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

Date	November 2020	Marks available	[Maximum mark: 2]	Reference code	20N.3.SL.TZ0.b(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.b(i)

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

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.

Syllabus sections

Option A: Relativity

Option A: Relativity » Option A: Relativity (Core topics) » A.2 – Lorentz transformations

Option A: Relativity » Option A: Relativity (Core topics)

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

Select a Test

Syllabus sections

Confirm action