DP Physics (last assessment 2024)

Question 18M.3.SL.TZ1.a.i

Date	May 2018	Marks available	[Maximum mark: 1]	Reference code	18M.3.SL.TZ1.a.i
Level	SL	Paper	3	Time zone	TZ1
Command term	Calculate	Question number	a.i	Adapted from	N/A

a.i.

[Maximum mark: 1]

18M.3.SL.TZ1.a.i

Muons are created in the upper atmosphere of the Earth at an altitude of 10 km above the surface. The muons travel vertically down at a speed of 0.995c with respect to the Earth. When measured at rest the average lifetime of the muons is 2.1 μs.

Calculate, according to Galilean relativity, the time taken for a muon to travel to the ground.

[1]

Markscheme

« $\frac{{{{10}^4}}}{{0.995 \times 3 \times {{10}^8}}} =$ » 34 «μs»

Do not accept 10⁴/c = 33 μs.

[1 mark]

Syllabus sections

Option A: Relativity

Option A: Relativity » Option A: Relativity (Core topics) » A.1 – The beginnings of relativity

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

Question 18M.3.SL.TZ1.a.i

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