Which statement below concerning the photoelectric effect is true? view available hint(s) which statement below concerning the photoelectric effect is true? there is a threshold frequency for each metal, and only light of a frequency higher than this threshold causes electrons to be emitted from the metal surface. light with a frequency below the threshold frequency can still cause electrons to be emitted from the metal surface, but there will be a lag time while sufficient energy to dislodge the electrons builds up. there is a threshold wavelength for each metal, and only light of a longer wavelength than this threshold causes electrons to be emitted from the metal surface. increasing the intensity (amplitude) of the light shined on a metal surface is sufficient to cause the emission of electrons from a metal surface.