Graphics Reference
In-Depth Information
function of T (i.e., for fixed T , find the f that maximizes power). Show that this
is roughly linear in T . (This is known as Wien's displacement law. )Todoso,fix
T , and define a variable u = f
T , and write R ( f , T ) as a function S ( u )= T 3 u 3
/
D ( u ) ,
where D ( u )= e ( h / k ) u
1, which depends only on the single variable u . Under
what condition on u is S ( u ) a maximum? (You may assume that e ( h / k ) u
1.)
For T near 10,000 K (roughly the temperature of the surface of the sun),
the peak is at about frequency 5
>>
10 14 Hz, which is just about in the middle of
the range of visible light (roughly 4
×
10 14 Hz); this means that
the human visual system is most sensitive to the energy that's most common (sun-
light).
10 14 Hz to 7
×
×
 
Search WWH ::




Custom Search