Dalén’s sun valve linked to a beacon
SPL
The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and Highers/Advanced Highers exam specifications.
The 1912 Nobel prize for physics was awarded to the inventor of a light-sensitive switch operated by thermal expansion and the absorption of solar radiation.
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