3 A beam of electromagnetic radiation of intensity 6 4 x 10 5 W cm is comprised of wavelength 310 nm It falls normally on a

Question

3 A beam of electromagnetic radiation of intensity 6 4 x 10 5 W cm is comprised of wavelength 310 nm It falls normally on a metal work function 2eV of surface area of 1 cm If one in 103 photons ejects an electron total number of electrons ejected in 1s is 10 he 1240 eVnm leV 1 6x10 19 J then x is

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