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The unit for measuring the rate at which light energy is radiated from a source is the

A. candela.
B. lumen.
C. lux.
D. Angstrom.

Please explain

User Nurlan
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1 Answer

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The unit for measuring the rate at which light is radiated from a source is B, Lumen. Lumenous flux is the time rate of the flow of light, or the visible energy produced from a certain light source.  It is the quantitative measure of brilliance of a light source. The unit we use for this is lumen. 
User Ben Kamphaus
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