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h=6,26*10^(-34) J*s
c~300000000m/s
lambda=?
h*v=Ek+W (Ek=0, bo wystarczy żebyśmy tylko wybili elektrony)
h*v=W
v=c/lambda
h*c/lambda=W
lambda=(h*c)/W [m]
lambda=(6,26*10^(-34)*300000000)/(7,52*10^(-19))
lambda~2,5*10^(-7)m=250nm