Photoemission of electrons occurs from a metal \((\phi_0=1.96\,\text{eV})\) when light of frequency \(6.4\times10^{14}\,\text{Hz}\) is incident on it. Calculate the maximum kinetic energy of the emitted electrons.
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For photoelectric effect problems, always use
\[
K_{\max}=h\nu-\phi_0.
\]
If photon energy and work function are given in eV, perform the subtraction directly in eV.