A box slides on frictionless ice and collides with another box sliding in the same direction. If the two boxes stick together after the collision,what assumption can
be made about the type of collision that occurred? *
It was a completely elastic collision.

The correct answers are "wave" and "particle".

Explanation:

Photoelectric effect: It is the phenomenon in which there is an emission of the electrons when the light is incident on the surface of the metal.

The wave nature of the light is explained by reflection.

Reflection: Reflection is the phenomenon in which the light wave gets reflected from the surface without getting absorb. It bounces back from the surface.  

Light demonstrates the characteristics of both particles and wave.

Therefore,  Light travels as wave and interacts with matter as particle.