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 :
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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 :

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G1 Physics · Accepted Answer

Step 1: Use Eγ = hν = hc/λ and Kₘₐₓ = hν−φ = eVₛ. Step 2: Apply the threshold condition Kₘₐₓ = 0 where required and use the given photon energy/frequency. Final: B: − 3 V.