A quantity is subject to exponential decay if it decreases at a rate proportional to its current value. Symbolically, this process can be expressed by the following differential equation, where N is the quantity and λ (lambda) is a positive rate called the exponential decay constant, disintegration constant, rate constant, or transformation constant:
![](\"https://wikimedia.org/api/rest_v1/media/math/render/svg/1a0ea52e848d72d5c07c809cf0eb46fb73f54dc6\")
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{"type":"standard","title":"Acanthurus nigrofuscus","displaytitle":"Acanthurus nigrofuscus","namespace":{"id":0,"text":""},"wikibase_item":"Q1536194","titles":{"canonical":"Acanthurus_nigrofuscus","normalized":"Acanthurus nigrofuscus","display":"Acanthurus nigrofuscus"},"pageid":20652086,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/5/54/Acanthurus_nigrofuscus_by_NPS.jpg/330px-Acanthurus_nigrofuscus_by_NPS.jpg","width":320,"height":191},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/5/54/Acanthurus_nigrofuscus_by_NPS.jpg","width":504,"height":301},"lang":"en","dir":"ltr","revision":"1265644110","tid":"6af9b894-c4aa-11ef-9c1d-53fab08473a7","timestamp":"2024-12-27T23:29:29Z","description":"Species of fish","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Acanthurus_nigrofuscus","revisions":"https://en.wikipedia.org/wiki/Acanthurus_nigrofuscus?action=history","edit":"https://en.wikipedia.org/wiki/Acanthurus_nigrofuscus?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Acanthurus_nigrofuscus"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Acanthurus_nigrofuscus","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Acanthurus_nigrofuscus","edit":"https://en.m.wikipedia.org/wiki/Acanthurus_nigrofuscus?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Acanthurus_nigrofuscus"}},"extract":"Acanthurus nigrofuscus, the brown surgeonfish, blackspot surgeonfish, brown tang, dusky surgeon, lavender tang or spot-cheeked surgeonfish, is a species of marine ray-finned fish belonging to the familyAcanthuridae, which includes the surgeonfishes, unicornishes and tangs. This species is a common and abundant fish occurring across a wide Indo-Pacific range.","extract_html":"
Acanthurus nigrofuscus, the brown surgeonfish, blackspot surgeonfish, brown tang, dusky surgeon, lavender tang or spot-cheeked surgeonfish, is a species of marine ray-finned fish belonging to the familyAcanthuridae, which includes the surgeonfishes, unicornishes and tangs. This species is a common and abundant fish occurring across a wide Indo-Pacific range.
"}{"fact":"A cat's field of vision is about 200 degrees.","length":45}
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