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MCQIntermediateLight, Radiation & Spectroscopy
BAAO — 2021 Astronomy & Astrophysics Challenge
Question 8
Estimate the number of photons incident on a human pupil (of radius 2mm) from the Sun per second when it is at the zenith on a clear day.
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Source
Source: British Astronomy and Astrophysics Olympiad (BAAO), Astronomy & Astrophysics Challenge 2021. Question text, answer-choice text, and answer were transcribed from the official BAAO paper and solutions PDFs; the explanation and metadata are original.