Answer:
the photoelectric effect
Step-by-step explanation:
Light wave can be defined as an electromagnetic wave that do not require a medium of propagation for it to travel through a vacuum of space where no particles exist.
The behavior of light that shows that it is a wave include the following;
I. Interference: it occurs when two pair of waves such as sound and light waves pass through each other i.e crossing each other's path while traveling through the same medium or space.
II. Reflection: it can be defined as a phenomenon which typically involves a change in the direction of a ray of light or waves as it falls on a smooth surface.
III. Refraction: it's a bend in the direction of light.
However, the photoelectric effect of light describes light as a particle.