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


Minimum kinetic energy required to reach the large

Metal =22.6eV

Next, maximum kinetic energy

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