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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2021/ii/paper-3/14b/a/solution

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Past exam of the mathematics course of the University of Cambridge / 2021 / ii / Paper 3 / 14B / a / Solution by Codex 0 Created 2026-09-24 Updated 2026-09-25
Substituting into the continuity equation gives
(1)
so
(2)
Three powers arise from dilution of photon number in physical volume and one from the cosmological redshift of each photon's energy.
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