Question
The work function of potassium is $3.68 \times 10^{-19} \mathrm{J}$ (a) What is the minimum frequency of light needed to eject electrons from the metal? (b) Calculate the kinetic energy of the ejected electrons when light of frequency equal to $8.62 \times 10^{14} \mathrm{s}^{-1}$ is used for irradiation.
Step 1
This energy is given by the equation $W = h\nu$, where $W$ is the work function, $h$ is Planck's constant, and $\nu$ is the frequency of the light. Show more…
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