Photons with energy `5 eV` are incident on a cathode `C` in a photoelectric cell . The maximum energy of emitted photoelectrons is `2 eV`. When photons of energy `6 eV` are incident on `C` , no photoelectrons will reach the anode `A` , if the stopping potential of `A` relative to `C` isA. ` - 1 V`B. `- 3 V`C. `+ 3 V`D. `+ 4 V`

Photons with energy `5 eV` are incident on a cathode `C` in a photoele

1.	Photons with energy `5 eV` are incident on a cathode `C` in a photoelectric cell . The maximum energy of emitted photoelectrons is `2 eV`. When photons of energy `6 eV` are incident on `C` , no photoelectrons will reach the anode `A` , if the stopping potential of `A` relative to `C` isA. ` - 1 V`B. `- 3 V`C. `+ 3 V`D. `+ 4 V`
Answer» Correct Answer - B `eV_(s) = (1)/(2) mv_(max)^(2) = hv - phi_(0)` ` 2 = 5 - phi_(0) rArr phi_(0) = 3 eV` In second case `eV_(s) = 6 - 3 = 3 eV rArr V_(s) = 3 V` `:. V_(AC) = - 3 V`

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