Final answer:
True, light from an unshaded bulb indeed radiates in all directions and its intensity decreases with increasing distance according to the inverse square law.
Step-by-step explanation:
The statement that light from an unshaded bulb radiates in all directions is true. In physics, when we consider the propagation of light, we understand that light emanates from sources like light bulbs in spherical waves, spreading out and diminishing in intensity as the distance from the source increases. This can be explained by the inverse square law, which states that the intensity of light is inversely proportional to the square of the distance from the source. As light moves away from the bulb, it covers a larger area and therefore the same amount of light is distributed over a larger surface, leading to a decrease in intensity or brightness.