For the photoelectric effect, set the threshold wavelength. The maximum wavelength of incident light for a metal surface above which incident light cannot repel electrons is called the threshold wavelength for that metal. All the amount of radiation that falls on the surface is absorbed by the surface These tools were very useful. Thank you very much. When part of the radiation is absorbed and the remaining part of the wavelength associated with the charged particles is reflected. . Your email address will not be published. Required fields are marked with a *. . . .