The distribution of relativity intensity I(λ) of blackbody radiation from a solid object versus the wavelength λ is shown in the figure. If Wien displacement law constant is 2.9 × 10−3 mK, what is the approximate temperature of the object?
A. 10 K
B. 50 K
C. 250 K
D. 1,500 K
E. 6,250 K
(GR0177 #63)
Solution:
Wien's Law relates the temperature with the wavelength at maximal intensity.
λT = 2.9 × 10−3 mK
λ at maximum intensity: 2 × 10−6m
T = (2.9 × 10−3) mK / (2 × 10−6 ) m ≈ 1,500 K
Answer: D
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