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Question 19N.3.SL.TZ0.4c(i)

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.3.SL.TZ0.4c(i)
Level SL Paper 3 Time zone TZ0
Command term Draw Question number c(i) Adapted from N/A
c(i).
[Maximum mark: 1]
19N.3.SL.TZ0.4c(i)

A train is moving across a bridge with a speed v = 0.40c. Observer A is at rest in the train. Observer B is at rest with respect to the bridge.

The length of the bridge LB according to observer B is 2.0 km.

According to observer B, two lamps at opposite ends of the bridge are turned on simultaneously as observer A crosses the bridge. Event X is the lamp at one end of the bridge turning on. Event Y is the lamp at the other end of the bridge turning on.

Events X and Y are shown on the spacetime diagram. The space and time axes of the reference frame for observer B are x and ct. The line labelled ct' is the worldline of observer A.

(c(i))

Draw, on the spacetime diagram, the space axis for the reference frame of observer A. Label this axis x'.

 

[1]

Markscheme

x′ axis drawn with correct gradient of 0.4 ✔

 

NOTE: Line must be 1 square below Y, allow ±0.5 square.

Allow line drawn without a ruler.

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