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T=5800;λmin=50*10^(-9);λmax=3000*10^(-9);L=(2*h*c^2)/(λ^5)*1/(Exp[(h*c)/(k*λ*T)]-1);Lir=Piecewise[{{0,0<λ<780*10^(-9)},{L,780*10^(-9)<λ<3000*10^(-9)}}];Lsichtbar=Piecewise[{{0,0<λ<380*10^(-9)},{L,380*10^(-9)<λ<780*10^(-9)}},{0,780*10^(-9)<λ<3000*10^(-9)}];Lsichtbar=Piecewise[{{0,0<λ<380*10^(-9)},{L,380*10^(-9)<λ<780*10^(-9)}},{0,780*10^(-9)<λ<3000*10^(-9)}];Luv=Piecewise[{{0,0<λ<100*10^(-9)},{L,100*10^(-9)<λ<380*10^(-9)},{0,380*10^(-9)<λ<3000*10^(-9)}}];h=6.626*10^(-34);c=2.998*10^8;k=1.381*10^(-23);kurve1=Plot[L,{λ,λmin,λmax},AxesLabel{"λ in m","L in J/(m^3*s)"},PlotRangeAll]kurveir=Plot[Lir,{λ,λmin,λmax},AxesLabel{"λ in m","L in J/(m^3*s)"},PlotRangeAll,FillingAxis,FillingStyleRed,PlotLegendsSwatchLegend[{Red,Green,Blue},{"Infrarot","Sichtbar","Ultraviolett"}]];kurvesichtbar=Plot[Lsichtbar,{λ,λmin,λmax},AxesLabel{"λ in m","L in J/(m^3*s)"},PlotRangeAll,FillingAxis,FillingStyleGreen];kurveuv=Plot[Luv,{λ,λmin,λmax},AxesLabel{"λ in m","L in J/(m^3*s)"},PlotRangeAll,FillingAxis,FillingStyleBlue];Show[kurve1,kurveir,kurvesichtbar,kurveuv]
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