Photoelectric Effect

Jules Bruno
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now, Einstein theorized that if a photon met an energy requirement and struck a metal surface, then electrons could be ejected. This is known as the photo electric effect. So here, if we look at it, we have a metal surface here, and on this metal surface, we have free flowing electrons in green. Now we're going to say that to this metal surface. I'm going to strike it with some form of energy here represented by energy of a photon. If it hits the surface with enough energy and enough force, it can dislodge one of these electrons. That electron can then convert that energy excess energy into kinetic energy and propel itself further away from the metal surface. So this is what we call our kinetic energy. Now, for this to happen, we have to realize that when the energy of the photons or light source is greater, then the energy of the surface, which we're gonna abbreviated as B e. Then we can inject an electron. But if the energy the light source is not greater than the energy off the surface of the metal, then electron will not be ejected from that metal service, and it will stay there. So this is basically the idea when it comes to the photo electric effect. Now let's click on to the next video and go a little bit more in detail about what exactly is energy K e versus energy be?