The work function of Cu is $7.68 \times 10^{-19} \mathrm{~J}$. 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 $\left(\mathrm{h}=6.63 \times 10^{-34} \mathrm{Js}\right)$

• A

  $2.64 \times 10^{-18}$
• Correct answer
  B

  $1.32 \times 10^{-19}$
• C

  $2.64 \times 10^{-19}$
• D

  $6.60 \times 10^{-19}$

Hence, the correct answer is option: 'B'.