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The candela is tied to the luminous efficacy of radiation of which frequency?
A540 x 10^12 Hz
B683 x 10^12 Hz
C540 x 10^9 Hz
D683 x 10^9 Hz
Answer & Solution
Correct answer: A. 540 x 10^12 Hz
The candela fixes the luminous efficacy of monochromatic radiation of frequency 540 x 10^12 Hz at 683 lm per W.
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