Question

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 is
(1) +3 V
(2) +4 V
(3) -1 V
(4) -3 V

Answer 1

Answer:

option 4

Explanation:

threshold potential of C=5-2=3eV

in second case when photon of 6eV is incident

threshold potential will remain same

so max KE of emmited electrons =6-3=3eV

so stopping potential is -3eV

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Answer 2

Explanation:

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