The surface of sodium metal is irradiated with radiation of wavelength $x \mathrm{~nm}$. The kinetic energy of ejected electrons is $2.8 \times 10^{-20} \mathrm{~J}$. The work function of sodium is 2.3 eV . The value of $x$ is $\_\_\_\_$ $\times 10^2 \mathrm{~nm}$. (Nearest integer)
(Given : $\mathrm{h}=6.6 \times 10^{-34} \mathrm{Js} ; \mathrm{leV}=1.6 \times 10^{-19} \mathrm{~J} ; \mathrm{c}=3.0 \times 10^8 \mathrm{~ms}^{-1}$ )
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