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PHYSICS ONLINE

Electromagnetic radiation

Carol Tear recommends some of the best websites for exploring electromagnetic radiation and its uses

The spectrum of electromagnetic radiation has a huge range of wavelengths — and frequency and photon energy (from E = hf = hc/λ) if you choose those measures to compare instead. Wavelengths as short as 1.24 × 10–20 m were detected in 2019 in the form of very high-energy gamma rays coming from the Crab Nebula. Read about the discovery in this Physics.org news article:

www.tinyurl.com/Crab-Nebula-photons

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Previous

Vapour trails and climate change

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Pratibha Gai

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