Answer :

Given, work function

Charge density


Distance d=20cm


Wavelength λ=400nm


We know that electric potential due to charged plate


is given by ,


where E is the electric field due to charged plate


and d is the distance between two plates




=


= 59V


Now, from Einstein’s photoelectric equation




Now putting the values of h, c, λ, Ф we get






≪≪V


Minimum kinetic energy required to reach the large


Metal =22.6eV


Next, maximum kinetic energy


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