The maximum wavelength of a beam of ligh...

The maximum wavelength of a beam of light can be used to produce photo electric effect on a metal is 250 nm. The energy of the electrons in Joule emitted from the surface of the metal when a beam of light of wavelength 200 nm is used `[h=6.62xx10^(-34)Js,C=3xx10^(8)ms^(-1)]`

`89.61xx10^(-22)`

`69.81xx10^(-22)`

`18.96xx10^(-20)`

`19.86xx10^(-20)`

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