Q.3:Consider photons contained in a thre states for the photons is given by D(E)dE %3D a) Show that the number of thermally excited photons is given by the expression N = 2.404 V(k, T)' b) Suppose that the number of photons N in the universe is constant, at a concentration of 1026 m. Find the critical Te such that Ne = N. Note: You are given that dx = 2.404 !3!
Q.3:Consider photons contained in a thre states for the photons is given by D(E)dE %3D a) Show that the number of thermally excited photons is given by the expression N = 2.404 V(k, T)' b) Suppose that the number of photons N in the universe is constant, at a concentration of 1026 m. Find the critical Te such that Ne = N. Note: You are given that dx = 2.404 !3!
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Q.3:Consider photons contained in a three-dimensional cavity of unit volume. The density of
states for the photons is given by
D(E)dE
%3D
a) Show that the number of thermally excited photons is given by the expression
V(k,T)'
N =2.404-
%3D
b) Suppose that the number of photons N in the universe is constant, at a concentration of 1026 m.
Find the critical Te such that Ne=N.
%3D
Note: You are given that
dx = 2.404
%3!
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