Although pure diamonds are colorless, some diamonds have color because of dopants. When intense red light strikes a sample of Cs metal in a photoelectric effect experiment, no electrons are ejected from the surface. In contrast, exciting the sample with weak blue light ejects electrons, whose kinetic energy can be measured. Red photons have more energy than blue photons. Red photons have less energy than blue photons.
Red photons have the same energy as blue photons.
A. B. An equation describing this experiment is 235. Consider two LEDs, one red and one green, both emitting at their band gap energy. More questions are needed for this section.