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The electric field of light wave is given as vector  E = 10-3 cos (2πx/5 x 10-7 -2π x 6 x 1014 t) x N/C.  This light falls on a metal plate of work function 2eV. The stopping potential of the photo-electrons is : Given E (in eV) = 12375/ λ(in Å).

(1)  0.72 V (2)  2.0 V (3)  0.48 V (4)  2.48 V

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Correct option (3) 0.48 V 

Explanation:

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