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).

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