Question

what happens if the photocell is moved away from the source (bulb?

Answer 1

Now, relating the number of photons to the distance to the light bulb is almost too simple. ... What will happen to the stopping potential if the distance between the source of light and photocell is increased? ... So, the useful radiation received by a photocell falls (by inverse square ...

Answer 2

The radiation received by photocell falls .
Hpe it helps^_^;^_^;