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JEE Main 7 Jan 2020 Shift 1 Solved Paper

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Question : 23

Total: 75

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

[7-Jan-2020 Shift 1]

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