An object is moving away from the light source at a rate of 4 units/s. Find the rate of change of the intensity of illumination when it is 2 units from the light source.
yeah, this is my answer:
rate of change = k(1/unit˛xsecond)
The intesity of illumination as a function of distance from a point source is:Originally Posted by mathletes
where is the intensity of illumination at a distance of unit from the source.
So now you only need to plug in and to get the answer, in units of
(whatever you are using as units of intensity)/s.