Question

In a photoelectric effect, the yellow light is just able to emit electrons, will green light emit photoelectrons? What about red lights?

Answer 1

When electromagnetic radiation, such as light, strikes a substance, it causes electrons to be emitted. Photoelectrons are electrons that are emitted in this way. To draw conclusions about the characteristics of atoms, molecules, and solids, the phenomena is investigated in condensed matter physics, solid state chemistry, and quantum chemistry. The effect is used in electrical systems that are designed to detect light and emit electrons at specific times.

Complete answer:
When green light strikes a metal, it emits photoelectrons, indicating that the frequency of green light is the threshold frequency. This is the lowest frequency at which an electron may be knocked out of a metal surface. Because green light photons have greater energy than yellow light photons, they expel electrons.

The wavelength of light is inversely related to its frequency. Because the wavelengths of yellow and red light are longer than those of green light, their frequencies are lower, and no photoelectrons are produced when yellow or red light strikes metal. Because red light photons have less energy than yellow light photons, they are unable to expel electrons.

A few electron-volt (eV) light quanta, comparable to short-wavelength visible or ultraviolet light, are required for the emission of conduction electrons from common metals. In extreme instances, such as in systems with negative electron affinity and emission from excited states, or a few hundred keV photons for core electrons in elements with a large atomic number, emissions are triggered with photons approaching zero energy. The study of the photoelectric effect led to significant advances in our knowledge of the quantum nature of light and electrons, as well as influencing the development of the wave–particle duality idea.

Note: A light beam's photons have a distinctive energy, termed photon energy, that is proportional to the light's frequency. When an electron within a material absorbs the energy of a photon and gains more energy than its binding energy, it is likely to be expelled in the photoemission process. The electron cannot exit the substance if the photon energy is too low. Because an increase in the intensity of low-frequency light will simply increase the quantity of low-energy photons, no single photon with enough energy to dislodge an electron will be created.