Physics - Modern Physics Question with Solution | TestHub

A beam of electromagnetic radiation of intensity$6.4\times {10}^{-5}\text{W}/{\text{cm}}^2$is comprised of wavelength,$\mathrm{}\lambda =310\mathrm{n}\mathrm{m}$. It falls normally on a metal (work function$\phi =2eV$) of surface area of$1\mathrm{}{\mathrm{c}\mathrm{m}}^2$. If one in${10}^3$photons ejects an election, total number of electrons ejected in$1\mathrm{}\mathrm{s}$is${10}^x$.$\left(hc=1240\mathrm{e}\mathrm{V}\mathrm{n}\mathrm{m},1\mathrm{e}\mathrm{V}=1.6\times {10}^{-19}J\right),$then$x$is ___________