(2 points) a pair of students measure the intensity of light from a desklamp in sec. 4.5 of the experiment. when the detector is 25 cm from the lamp, the signal measured by the detector is 0.74 v. how large a signal (in v) do the students expect when the detector is 47 cm away?

At 47 cm signal will be of 0.2093 volt

Explanation:

We have given the the the signal measured by the detector at a distance of 25 cm is 0.74 volt

We have to find the intensity of the signal at a distance of 47 cm

We know that intensity inversely proportional to the square of distance

So , here  is intensity at 25 cm and   is intensity at 47 cm

So