Question

what is the power of the lamp if its lumious efficiency is 2 watt and its lumious intensity is 42 candela​

Answer 1

Answer:

I THINK

Explanation:

Luminous flux=Luminous intensity∗solid angle

Total solid angle = 4 π

So, Luminous flux = 700 x 4 π

Luminous flux = Luminous efficiency x power

=> 700 x 4 π = 8.8 x power

=> Power of lamp = 1000 W

Answer. 10 w