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A source of monochromatic radiation of w...

A source of monochromatic radiation of wavelength 400 nm provides 1000 J of energy in 10 seconds. When this radiation falls on the surface of sodium, `x xx 10^(20)` electrons are ejected per second. Assume that wavelength 400 nm is sufficient for ejection of electron from the surface of sodium metal. The value of x is ________ .
(Nearest integer)
`( h = 6 . 626 xx 10 ^(-34) Js)`

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