Grotthuss-Draper law

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English[edit]

English Wikipedia has an article on:
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Etymology[edit]

Proposed in 1817 by Theodor Grotthuss and in 1842, independently, by John William Draper.

Proper noun[edit]

the Grotthuss-Draper law

  1. (physics) The principle stating that only that light which is absorbed by a system can bring about a photochemical change.
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