Uploaded March 2024 | Updated September 2026, 2 weeks ago

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In this video we look at an amazing problem from the British Physics Olympiad Senior Physics Challenge, BPhO SPT from 2017.
Please note that full credit to this amazing problem goes to the British Physics Olympiad team - what an amazing problem!
Find the original paper here: bpho.org.uk/Papers/SPC/BPhO_AS_2017_QP.pdf
Mark Scheme: bpho.org.uk/Papers/SPC/BPhO_AS_2017_MS.pdf
We use energy conservation and some quantum physics to derive a classical approximation of the change in frequency of a photon in a gravitational field.
Please note that this is not an official solution and I may have some mistakes.
The Problem can also be used as a challenge problem for A Level Physics for all exam boards including OCR, AQA, Edexcel, CIE etc.