If a clean, positively charged zinc plate is exposed to intense white light it will not discharge. If a clean, negatively charged zinc plate is exposed to intense white light it will not discharge.
How can that be? The fact light can act like particles sometimes and waves at other times is something that has long been studied, and the wave-particle duality is one basic explanation.
In fact, in a lot of experiments light acts much more like a wave than like a particle. This wave nature produces some interesting effects. For example, if an electron traveling around a nucleus ...
Scientists have come a step closer to understanding how collisionless shock waves -- found throughout the universe -- are able to accelerate particles to extreme speeds.