Question

What happens to ejected photoelectrons KE if the wavelength of incident light decreases?

Answer 1

1. Photo electric effect: The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. Electrons emitted in this manner are called photoelectrons.
2. The maximum kinetic energy of the electrons emitted during the photoelectric effect increases when the wavelength of the light is decreased.
3. The maximum kinetic energy related to the photoelectrons can be written as: $K.E=\frac{hc}{\lambda }-\varphi$
   where the planks constant, $c$ is the speed of the light, $\lambda$is the wavelength of the incident photon, $\varphi$ is the work function.
4. The work function is a property of material it remains constant.
5. The kinetic energy is inversely proportional to the $\lambda$ wavelength of the incident photon.

Therefore the kinetic energy of the emitted photon will increase if the wavelength is decreased.