Question: help with a loglogplot

I am trying to create a simple loglogplot, but i am getting an empty plot error. Here is my code:

 

with(plots);

 

c:=2.998*10^8;

k:=1.381*10^(23);

h:=6.626*10^(-34);

t:=4500;

 

Plancks_Law:=x->(8*Pi*h/(c^3))*(x^3/(exp(h*x/(k*t))-1));

loglogplot(Plancks_Law(x),x=1..100);

 

I don't care what the domain is, but anything I try gives the same error. How can I get this to plot?

 

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