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Question 19M.3.HL.TZ1.b.i

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.HL.TZ1.b.i
Level HL Paper 3 Time zone TZ1
Command term Explain, State Question number b.i Adapted from N/A
b.i.
[Maximum mark: 2]
19M.3.HL.TZ1.b.i

A box is in free fall in a uniform gravitational field. Observer X is at rest inside the box. Observer Y is at rest relative to the gravitational field. A light source inside the box emits a light ray that is initially parallel to the floor of the box according to both observers.

State and explain the path of the light ray according to observer X.

[2]

Markscheme

X is in an inertial frame ✔

so light will follow a straight line path «parallel to the floor of the box» ✔

Examiners report

Freefall in a gravitational field. Most of the candidates answered well but in b) omitted to mention that X is inertial.

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