Question

An incandescent light bulb radiates uniformly in all directions with a total average power of 1.0 × 102 W. What is the average intensity of the light at a distance of 1.0 m from the bulb?

Answer 1

Here

Power = 100 W

distance , d = 1 m

for the average intensity

average intensity = Power/(4pi * r^2)

average intensity = 100/(4pi * 1^2)

average intensity = 7.96 W/m^2

the average intensity at 0.60 m is 7.96 W/m^2