A source of monochromatic radiation of wavelength \( 400 \mathrm{~nm} \) provides \( 1000 \mathrm{~J} \) of energy in 10 seconds. When this radiation falls on the surface of sodium, \( \mathrm{x} \times 10^{20} \) electrons are ejected per second. Assume that wavelength \( 400 \mathrm{~nm} \) is sufficient for ejection of electron from the surface of sodium metal. The value of \( \mathrm{x} \) is ........ \( \left(\mathrm{h}=6.626 \times 10^{-34} \mathrm{Js}\right) \)

[JEE Main 2021, 25 Jul (Shift 1)]

Question

A source of monochromatic radiation of wavelength \( 400 \mathrm{~nm} \) provides \( 1000 \mathrm{~J} \) of energy in 10 seconds. When this radiation falls on the surface of sodium, \( \mathrm{x} \times 10^{20} \) electrons are ejected per second. Assume that wavelength \( 400 \mathrm{~nm} \) is sufficient for ejection of electron from the surface of sodium metal. The value of \( \mathrm{x} \) is ........ \( \left(\mathrm{h}=6.626 \times 10^{-34} \mathrm{Js}\right) \)

[JEE Main 2021, 25 Jul (Shift 1)]

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