Ee-372-2009-t1-midte - 1 Photo-electric Effect A multi-alkali metal is used as the photocathode material in a photo-emissive electron tube The

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1. Photo-electric Effect a) A multi-alkali metal is used as the photocathode material in a photo-emissive electron tube. The longest wavelength radiation that gives photo-emitted electrons is 510 nm. If ultra-violet radiation of wavelength 200 nm is incident on to this photocathode, what is the@(ineV)ofthephoto-emittedelectrons?Whatisthery!*- funcfion of the metal? What voltage applied to the collecting electrode would extinguish the photocurrent? A*x' 5/o AnA /.7oonn eh.x (U.USxto'otJ'r) {$xto6 ^751 = ( l. 6 (dr'tt cl?-ilo,1ro'?,*\ u ; ,*ta l**l,n - (C.G3xtottr rj(Sxtor,^rs) -_ b. Zz (l.Av6'' c\ (Loo 7<to-1 ,*) w= €-f €, oa K€, L,z,zc'l - 2.F{ cV " istor = r74/ 7l* 'd#d*l. rl#_g.- -i- e-t/ -/4/ 1./ f ,l 2 af e{ [ 3 t{'i-\
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2. Schrodinger's Equation Aninfinitesteppotentialhas V=0for x<0 and.V:m for x>0 asillustratedbelow.An electron is incident from the left onto the step with energy E. a)
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This note was uploaded on 01/20/2011 for the course EE 372 taught by Professor Johanson/kasap during the Fall '10 term at University of Saskatchewan- Management Area.

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Ee-372-2009-t1-midte - 1 Photo-electric Effect A multi-alkali metal is used as the photocathode material in a photo-emissive electron tube The

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