00:01
Question wants to know why the photoelectric effects suggest that light has particle -like properties.
00:07
So the photoelectric effect supports the particle theory of light insofar that it behaves like an elastic collision, one that conserves energy.
00:17
And this collision is taking place between two particles, the photon of light and the electron in the metal.
00:22
So if you shine a light on a metal of any intensity with an energy that's below the binding energy of the electron, there isn't going to be any electrons ejected from the metal.
00:29
But as soon as the frequency of that light, or in other words, the wave is high enough, or in other words, the wavelength of the light is low enough, since frequency and wavelength are inversely proportional, the energy can exceed the binding energy of the electron in the metal, and therefore the electron can be knocked off or ejected.
00:47
So essentially what i'm saying here is that the photoelectric effect shows the particle light properties of matter because the light in electron behaves similarly to an elastic collision.
00:58
Sorry about that.
00:59
Spelled elastic wrong.
01:00
In order for an electron to be ejected from a metal, the energy of an incoming photon must exceed the binding energy of the electron to that metal...