The work function of $Cu$ is $7.68 \times 10^{-19} \ J$. If photons of wavelength $221 \ nm$ are made to strike the surface of the metal,the kinetic energy (in $J$) of the ejected electrons will be $\left(h=6.63 \times 10^{-34} \ Js, c=3 \times 10^8 \ ms^{-1}\right)$.
- A$2.64 \times 10^{-18}$
- B$1.32 \times 10^{-19}$
- C$2.64 \times 10^{-19}$
- D$6.60 \times 10^{-19}$
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