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Question 18M.3.HL.TZ1.7c

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.HL.TZ1.7c
Level HL Paper 3 Time zone TZ1
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 2]
18M.3.HL.TZ1.7c

An observer A is on the surface of planet X. Observer B is in a stationary spaceship above the surface of planet X.

Observer A sends a beam of light with a frequency 500 THz towards observer B. When observer B receives the light he observes that the frequency has changed by Δf.

M18/4/PHYSI/HP3/ENG/TZ1/07_01

Observer B then sends a signal with frequency 1500 THz towards observer A.

M18/4/PHYSI/HP3/ENG/TZ1/07_02

(c)

Observer A now sends a beam of light initially parallel to the surface of the planet.

M18/4/PHYSI/HP3/ENG/TZ1/07.c

Explain why the path of the light is curved.

[2]

Markscheme

the mass of the planet warps spacetime around itself

the light will follow the shortest path in spacetime «which is curved»

[2 marks]

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