First slide
Photo Electric Effect

All electrons ejected from a surface by incident light of wavelength 200nm can be stopped before travelling 1m in the direction of uniform electric field of 4N/C. The work function of the surface is


Work done by electric field = eEx
                                           = e x 4 x 1 = 4eV
Energy photon  12400020000=6.2ev
hv = W + eVs
6.2 = W + 4
W = 2.2 eV

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