delongk said:With what speed will the fastest photoelectrons be emitted from a surface wih threshold wavelength of 600nm when the surface is illuminated with light of wavelength of 400nm?
delongk said:how does that help? i still don't understand.
Threshold wavelength photoelectrons refer to the minimum wavelength of light required to eject an electron from a metal surface through the photoelectric effect.
The threshold wavelength determines the energy of the ejected electrons and can provide information about the energy levels of the metal atoms. It also helps to understand the wave-particle duality of light.
The threshold wavelength can be determined by measuring the stopping potential, which is the minimum potential difference required to stop the ejected electrons from reaching the anode. The threshold wavelength is then calculated using the equation λ = hc/E, where h is Planck's constant, c is the speed of light, and E is the energy of the ejected electrons.
The threshold wavelength can be affected by the type of metal used, the intensity of the incident light, and the work function of the metal, which is the minimum energy required to remove an electron from its surface.
The photoelectric effect is the phenomenon where electrons are ejected from a metal surface when it is exposed to light of a certain frequency. The threshold wavelength is the minimum frequency of light required to cause this effect, and it is directly related to the energy of the ejected electrons.