Question

A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions. What is the average intensity of the light from this bulb at a distance of 0.400 m from the bulb

Answer 1

29.85 W/ m^2

Step-by-step explanation:

Answer 2

Answer:
`29.85\ W/m^2`

Step-by-step explanation:

Given

Power
`P=60\ W`

Distance from the light source
`r=0.4\ m`

Intensity is given by

`I=(P)/(4\pi r^2)`

Inserting values

`\Rightarrow I=(60)/(4\pi (0.4)^2)\\\\\Rightarrow I=(60)/(2.010)\\\\\Rightarrow I=29.85\ W/m^2`