photoelectric threshold of silver is 380A° ultra violet light of 2600A° is incident on a silver surface. calculate work function in electron volt, maximum kinetic energy of emited photoelectron, maximum velocity of photoelectron.
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- KE= E - phi(work function)
- E= 12400/lemda ev
- so E= 12400/2600= 4.76ev
- Phi = 12400/380=32.63ev
- phi>E
- so there is no photoelectric Effect
- hence KE is 0
- Max Velocity is also 0
- as you know KE = 1/2MV2
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