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what is the work fuction of the metal ...

what is the work fuction of the metal if the light of wavelength 4000Å generates photoelectrons of velocity `6xx10^(5) ms^(-1)` from it ?
(Mass o felectron `=9xx10^(-31)`kg
Velocity of light `=3xx10^(8)ms^(-1)`
Planck's constant `=6.626xx10^(-34)Js`
Charge of electron `=1.6xx10^(-19)jeV^(-1)`

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