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Question

A source emits 31.4 W of radiant flux distributed uniformly in all directions. The luminous efficiency is 60 lumen/W. Find the luminous intensity of the source.

A
600 πCd
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B
600 Cd
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C
150 Cd
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D
100 Cd
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Solution

The correct option is D 150 Cd
The Radiant flux from source = 31.4W
Solid angle = 4π (uniformly in all directions)
Luminous efficiency = 60 lumen/W
So, Luminous intensity is given as:

=Luminousflux4π=60×31.44π

150 Cd

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