Einstein’s Photoelectric Equation.

Solar energy is available to all free of cost and a major source of non-conventional energy.

The solar panel absorbs the sunlight and convert it into electrical energy.

This is a solar pannel, it absorbes the sunlight falling on it.

Solar panel works on the principal of Einstien’s photoelectric effect.

Let’s know more about Einsteins Photoelectric effect.

This is a metel plate on which incident photon of light collide with electron and then emission is happening.

This whole phenomenon of emission of electron due to the incident photons is known as the photoelectric effect.

Let’s know about the working of Einsteins Photoelectric effect.

The incident photon of light collides with an electron inside the atom and gives all its energy to the electron.

Part of energy of the photon is used by electron to come outside the surface, and rest part is Kinetic energy, with which the electron is emmited.

The minimum energy required by an electron to come out of the surface of the metal is photoelectric work function of the metal.

The work function W is the property of metals. It varies metal to metal.

Einstein’s Photoelectric effect is a relation of energy of a photon, maximum Kinetic energy and the work function.

This equation shows the conservation of energy.

Now lets know about the einstein’s plank equation.

According to Einstein and plank, the equation of energy in wave theory, is given by:

Let's rearrange Einstein’s photoelectric equation and put the value of Einstein's plank equation and we get:

This is the graph between frequency and maximum kinetic energy.

The maximum kinetic energy in the equation is always greater or equal to zero.

We say W/h is the threshold frequency or minimum frequency to release the electron, let represent it with .

The threshold frequency is the minimum frequency required to release a electron.

Now lets know about the stopping potential.

The measure of the value of is given by stopping potential.

Now let put the value of and rearrange the equation to get the value of stopping potential.

This is the graph of stopping potential and the frequency.

Revision

Einstein’s photoelectric equation shows the conservation of energy.

The graph between frequency and maximum kinetic energy is given by:

The threshold frequency is the minimum frequency required to release an electron.

The End