The work function of an electron present in the silicon atom is 1.1eV . Calculate the kinetic energy of the electron if the photon energy received by the silicon atom is 4.2eV

Answer 1

To calculate the kinetic energy of the electron after it absorbs the photon, we can use the following formula derived from the photoelectric effect:

\[ \text{Kinetic Energy (KE)} = \text{Photon Energy} - \text{Work Function} \]

Given:

• Photon Energy = 4.2 eV
• Work Function = 1.1 eV

Now, substituting the values into the formula:

\[ \text{KE} = 4.2 , \text{eV} - 1.1 , \text{eV} \] \[ \text{KE} = 3.1 , \text{eV} \]

Thus, the kinetic energy of the electron after absorbing the photon is 3.1 eV.