Multiple choice general knowledge

Australian scientists have achieved the most accurate measurement for the fundamental unit of light intensity. What are they referring to?

  1. Watts

  2. Candela

  3. Radian

  4. Steradian
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B Correct answer
Explanation

The candela (cd) is the SI base unit of luminous intensity, measuring the power of light emitted in a particular direction. Australian scientists made breakthrough measurements related to defining this fundamental unit more precisely. Watts measure power, radians and steradians measure angles (solid angle for steradian) - none of these measure light intensity. The candela is specifically designed to quantify perceived brightness of light sources.

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