Question
The stopping potential for photoeiectrons emitted from a surface illuminated by light of wavelength $\lambda=4910 \mathrm{~A}$ is $0.71 \mathrm{~V}$. When the incident wavelength is changed the stopping potential is found to be $1.43 \mathrm{~V}$. What is the new wavelength?
Step 1
Step 1: We know that the maximum kinetic energy $K_{max}$ of the emitted electrons is given by $h\nu - \phi$, where $h$ is Planck's constant, $\nu$ is the frequency of the incident light and $\phi$ is the work function of the material. Show more…
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