Practice question · True or false
A sensitivity speck becomes developable once it holds roughly three or four silver atoms.
Hints
- The number is astonishingly small.
- It is single figures, not thousands.
Show the answer
True
Why
True, and the smallness is the point. Three or four atoms, out of a crystal containing perhaps a thousand million silver ions, decide whether that crystal develops fully or not at all. Development is therefore a switch driven by an amplification of a hundred million or more.
Practise The Latent Image
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