Photoelectric Effect Uses

Introduction photoelectric effect:

Max Planck’s quantum theory: This theory is for black body radiation. This theory says that the atoms present in the black body can absorb or emit the radiation.

Photoelectric Effect:In 1887, photoelectric effect was invented by the scientist H.Hertz. When we passing a light into a material, the material should emit an electrons . This effect is called as photoelectric effect. Some of the rays produced in photoelectric effect are x-rays, ultraviolet rays and ?-rays.

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Facts of photoelectric effect:


Facts of photoelectric effect:

The photoelectric effect is an instantaneous effect.
The photoelectric effect has a threshold frequency in which it is different materials has different threshold frequency.
During the radiation the number of electrons released by the effect is proportional to the intensity of the radiation.
When radiations of different frequencies are used, the velocity of photoelectron increases with the increase in frequency.

Einsteins’s explanation for photoelectron effect:


Einsteins’s explanation for photoelectric effect:

Einstein’s says that every photon or a quantum of light has an energy value hv. Electrons are located inside the surface of the metal. There may be some amount of work W should be required for an electron to come out of the metal.

If the transferred energy is high comparing the internal attractions then the electrons gets liberated.In this the one photon can release a one electron.

Einsteins’s formula for photoelectric effect:

Kinetic energy required for releasing an electron is `1/2` mv^2 = hv-W

Where,

M-mass of electron

V-velocity of liberated electron

W-constant based on the metal

The Einsteins’s equation is suitable for hv < W.

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Applications of photoelectric effect:


Applications of photoelectric effect:

The application of the effect of photoelectric is used in the photoelectric cell which converts a light energy into electrical energy.
In cinematography photoelectric effect has a application of reproducing the sound.
Photoelectric effect also has an application in street lights for automatic switch on and off.
Traffic signals are using this effect for automatic controls.
Photoelectric effect has a application for count the machines.
Working of burglar alarm uses this photoelectric effect.
Television transmission is one of the applications of this photoelectric effect.