Question about electromagnetism

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Johann Ritter discovered ultraviolet light using silver chloride, which turns black when exposed to UV due to its dissociation into silver and chlorine. Sir William Herschel could not detect UV with a thermometer like he did with infrared because UV light does not penetrate most glass, including prisms used for separation. The sun emits significantly more infrared than ultraviolet, complicating direct detection methods. Ritter's discovery was not influenced by heat, highlighting the distinct properties of UV light compared to infrared. Understanding these differences is crucial in the study of electromagnetism and light.
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I was researching about the discovery of electromagnetism and how Johann Ritter (Discoverer of ultraviolet light) used silver chloride to discover the heat of ultraviolet light but why couldn't Sir william Herschel discover it with just a thermometer like infrared light?
 
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The sun emits much more infrared than ultraviolet. In addition, UV does not pass through most glasses, probably including the prisms used to separate infrared from visible light.
 
The turning black of silver chloride by light is due to the absorption of UV light by the molecule with its subsequent dissociation into Silver and Chlorine. Heat played no part in Ritter's discovery.
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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