Finding threshold frequency of a metal [closed]








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> Find threshold frequency, in $\mathrm{Hz}$, of a metal if it emits an electron with kinetic energy of $2.74 \times 10^{-19}~\mathrm{J}$ when illuminated with light with frequency of $1.49 \times 10^{15}~\mathrm{Hz}$.
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I am not sure what to do with this.


