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Question 17N.3.SL.TZ0.a

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.3.SL.TZ0.a
Level SL Paper 3 Time zone TZ0
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 1]
17N.3.SL.TZ0.a

A train is passing through a tunnel of proper length 80 m. The proper length of the train is 100 m. According to an observer at rest relative to the tunnel, when the front of the train coincides with one end of the tunnel, the rear of the train coincides with the other end of the tunnel.

Explain what is meant by proper length.

[1]

Markscheme

the length of an object in its rest frame

OR

the length of an object measured when at rest relative to the observer

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