Chapter 13 — Question 3
Is the kinetic temperature higher than the radiant temperature or the other way around?
Explain your answer with an example.
Answer
T
rad
is always smaller than T
kin
(except for blackbodies, where T
rad
= T
kin
). Exam-
ple: A granite of T
kin
= 300 K and with
ε
= 0.85, will display a brightness tempe-
rature, or T
rad
, of 288 K (using equation 13.6).
λ
max
= 1.97 µm for 1473.15 K absolute temperature (using equation 13.6).