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dane λ=100 nm = 1*10(-7)m, Uh=0,6V, h=6,62*10(-34)Js, m=9,1*10(-31)kg,
1 eV=1,6*10(-19)J
szukane W, λgr
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Równanie Einsteina - Millikana :
Ef = h*f = hc/λ = W + Ekmax = W + eUmax
hc/λ = W + eUmax
W = hc/λ - eUmax
W = [6,62*10(-34)Js*3*10(8)m/s//10(-7)m] - 0,6eV = 12,4eV - 0,6eV = 11,8eV
Praca wyjścia wynosi 11,8 eV = 18,88*10(-19)J
W = hc/λgr
λgr = hc/W = [19,86*10(-26)/18,88*10(-19)]s = 1,05*10(-7)m = 105 nm.
λgr wynosi 105 nm.
Semper in altum............................pozdrawiam :)
W razie wątpliwości - pytaj.