Cameroon GCE A-Level Physics

Practice session

Monochromatic ultraviolet light of wavelength $250\text{ nm}$ is incident on a clean zinc surface. If the work function of zinc is $\Phi = 4.30\text{ eV}$, Planck's constant is $h = 6.63 \times 10^{-34}\text{ J s}$, $c = 3.00 \times 10^8\text{ m s}^{-1}$, and $1\text{ eV} = 1.60 \times 10^{-19}\text{ J}$, what is the maximum kinetic energy of the emitted photoelectrons?

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