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Electric Field Due to a Sphere and Thin Shell

The graph sho...

Question

The graph shown below depicts plot of photocurrent versus anode potential for a cathode with 4 eV work function. The energy of the incident photon is

A

6 eV

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B

4 eV

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C

2 eV

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D

8 eV

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Solution

The correct option is A 6 eV
It is given that

Work function

$ϕ = 4 e V$

$V = 2 V$

From Einstein’s relation

$h ν = ϕ + E_{k}$

Where $h ν$ is the energy of photons. And E_k is the kinetic energy

$h ν = (4 + 2) e V$

$h ν = 6 e V$

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