DP Physics (first assessment 2025)

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Question 23M.2.HL.TZ2.5b

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.HL.TZ2.5b
Level HL Paper 2 Time zone TZ2
Command term Estimate Question number b Adapted from N/A
b.
[Maximum mark: 2]
23M.2.HL.TZ2.5b

A flash of light sent by an Earth observer at ct = 2.0 km is directed towards the spaceship.

(b)

Estimate, using the spacetime diagram, the time in seconds when the flash of light reaches the spaceship according to the Earth observer.

[2]

Markscheme

Line drawn at 45° from ct = 2 km to hit spaceship world line at ct = 5 km

OR

ct = 1.2/(c − 0.6c) + 2 = 5 «km» ✓

t = 5000c = 1.7 × 10−5 «s» ✓

 

Award [2] for BCA

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