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Question 19M.3.HL.TZ1.a

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.HL.TZ1.a
Level HL Paper 3 Time zone TZ1
Command term State Question number a Adapted from N/A
a.
[Maximum mark: 1]
19M.3.HL.TZ1.a

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 the equivalence principle.

[1]

Markscheme

a freely falling frame in a gravitational field is equivalent to an inertial frame
OR
a frame accelerating in free space is equivalent to a frame at rest in a gravitational field ✔

Examiners report

Freefall in a gravitational field. Most of the candidates answered well.

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