A beam of electromagnetic radiation of intensity  6.4×10−5 W/cm2 is comprised of wavelength, λ=310 nm. It falls normally on a metal(work function φ=2eV ) of surface area 1cm2. If one in 103photons ejects an electron, total number of electrons ejected in 1s is 10x (hc = 1240 eVnm, 1eV =  1.6 ×10-19J) , then x is _____