If you shine light of a specific frequency onto the surface of a metal, the metal will emit electrons. For most metals, this frequency falls in the UV range.
- Free electrons on the surface of the metal absorb energy from the light.
- If an electron absorbs enough energy, the bonds holding it to the metal break.
- The electons that are emitted are known as photelectrons.
Threshold frequency: frequency needed to to emit photoelctrons.
The photoelectrons that are emitted have different KEs. KE increases with the frequency and is unaffected by the intensity of the radiation.
Photons of light have a one-on-one, particle like interaction with an electron in a metal surface. If a photon collides with an electron when light hits the surface of the metal, the electron will gain energy equal to hf.
Before an electron can leave the surface of a metal, i tneeds enough energy to break the bonds holding it there. This energy is known as the work function and its value dpends on the metal.
Comments
No comments have yet been made