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Work Function

photons with ...

Question

photons with energy $5$ eV are incident on a cathode C in photoelectric is $2$ eV when photons of energy $6$ eV are incident on V no photoelectrons will reach the anode A,if the stopping potential of A

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Solution

energy of 5 ev maximum energy of emitted photoelectrons is therefore einstein photoelectric energy relation is
$ϕ = k_{m a x} - E_{p}$
$ϕ = 5 - 2 = 3 e V$
photon energy 6ev are incident no photon electrons emitted
${e V}_{0} = E_{p} - ϕ = 6 - 3 = 3 e v$
$V_{0} = 3$
strong potential of 3v has applied
it is different in negative potential $- 3$

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