A beam of light has three $\lambda ,4144\text{Å},4972\text{Å}$ and $6216\text{Å}$ with a total intensity of $3.6\times {10}^{-3}{\mathrm{Wm}}^{-2}$ equally distributed amongst the three $\mathrm{\lambda }$. The beam falls normally on an area $1.0 {\mathrm{cm}}^2$ of a clean metallic surface of work function $2.3\mathrm{eV}$. Assume that there is no loss of light by reflection etc. Calculate the no. of photoelectrons emitted in 2 sec, in scientific notation, $x\times {10}^y$ find the value of y.