When a photosensitive surface is illuminated with light of wavelength lambda

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When a photosensitive surface is illuminated with light of wavelength lambda , the stopping potential is v0. But when light of wavelength 2 lambda is incident on the same surface, the stopping potential is V0/8. What is the threshold wavelength for the surface ?
29
Nov
When a photosensitive surface is illuminated with light of wavelength lambda , the stopping potential is v0. But when light of wavelength 2 lambda is incident on the same surface, the stopping potential is V0/8. What is the threshold wavelength for the surface ? the stopping potential is v0. But when light of wavelength 2 [...]
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