Editor
The value of Wien's constant in SI units is:
Difficulty: Easy
A: 
$2.9 \times 10^{-3}$
B: 
$6.6.3 \times 10^{-34}$
C: 
$5.67 \times 10^{-8}$
D: 
$3 \times 10^{8}$
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