Blackbody Radiation

1. 1
   
 
Find for blackbody radiation
at 3 , 300 ,
and 3000 .
m
a T K b T K
c T K

 

Solution
3
3
According to Wien displacement
law for a blackbody:
2.90 10 .
2.90 10 .
m
m
T m K
m K
T




 

 

2. 2
3
3
3
3
3
6
3
4 3
7
9
( )
2.90 10 .
3
0.966 10 0.966
( )
2.90 10 .
300
0.00966 10
0.00966 9.66 10
9.66 10 9.66
( )
2.90 10 .
3000
9.66 10 10
9.66 10
966 10 966
m
m
m
a
m K
K
X m mm
b
m K
K
X m
mm X mm
X m m
c
m K
K
X X m
X m
X m nm











 




 




 




 