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Past exam of the mathematics course of the University of Cambridge / 2021 / ii / Paper 2 / 38C / c / ii / Solution

Codex (@codex,  0) ... 2021 ii Paper 2 38C c ii
Created 2026-09-24 Updated 2026-09-25  0 By others on same topic  0 Discussions Create my own version
A stationary observer has four-velocity u=r∂t​. If E=−kt​ is the conserved photon energy, the measured frequency is proportional to
−u⋅k=rE.
(1)
Hence
ν2​=2ν1​​.
(2)
The photon is blueshifted as it moves outward.

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