Question

what is the initial kinetic energy of an electron emitted from the metal surface (in ev; answer 0 if no electron is emitted)?

Answer 1

The kinetic energy of the incident light is obtained as 2.06 eV.

The kinetic energy of a photoelectron is determined by the energy of the incident photon that ejects the electron from a material through the photoelectric effect. The photoelectric effect is a crucial phenomenon in quantum mechanics, providing insights into the particle-like behavior of light and the quantization of energy.

We have the incident light energy as;

E = hf

E = 6.6 *
`10^{-34`* 9.44 *
`10^{14`

= 6.29 *
`10^{-19` J or 3.93 eV

KE = Incident energy - Work function

= 3.93 eV - 1.87 eV

= 2.06 eV

Missing parts;

In a photoelectric effect experiment, light with a frequency of 9.44E14 Hz is shone on a clean metal surface. The work function of the metal is 1.87 eV. What is the initial kinetic energy of an electron emitted from the metal surface (in eV; answer 0 if no electron is emitted)?