The work function of sodium metal is 4.41 × 10^-19 J. If photons of wavelength 300 nm are incident on the metal, the kinetic energy of the ejected…

The work function of sodium metal is $\displaystyle 4.41 \times 10^{-19} \mathrm{~J}$. If photons of wavelength $\displaystyle 300$ nm are incident on the metal, the kinetic energy of the ejected electrons will be $\displaystyle \left(\mathrm{h}=6.63 \times 10^{-34} \mathrm{~J} \mathrm{~s} ; \mathrm{c}=3 \times 10^8 \mathrm{~m} / \mathrm{s}\right)$ \_\_\_\_ $\displaystyle \times 10^{-21} \mathrm{~J}$.