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

Answer

A, C, D

Explanation

Radiant flux `=31.4W, solid angle =4pi` Luminous efficiency =60 lumne/W So, Luminous flux =`60xx31.4` lumen and luminous intensity
`=(Luminous Flux)/(4pi)`
`=(60xx(31.4))/(4pi)`
`=150 candela`