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 SQA exam specifications.
Photocells are made from semiconductor materials designed to generate an electric current when exposed to electromagnetic radiation. A photocell’s output depends on the radiation’s wavelength, which is related to photon energy, and its intensity. An inverse-square law describes how the intensity of solar radiation varies with distance.
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