# PhotoElectric Effect - Physics Notes - Engineering Diploma

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Published on February 15, 2014

Author: ednexa

Source: slideshare.net

## Description

PhotoElectric Effect - Physics Notes - Engineering Diploma by ednexa.com

Photo Electric Effect Electrons are present on the surface of conductor. These electrons are loosely bounded with the nucleus. In few metals these electrons are released from its surface when the metal is expose to light. This effect is known as photo electric effect. “Phenomenon of emission of electrons by metal surface under the action of light is called as photo-electric effect. The emitted electrons in this process are called as photo-electrons.” Alkali metals like sodium, potassium shows this effect.

1. Frequency of incident radiation. 1. Initially P.D. & intensity of radiation are kept constant. It is observed that, at low frequency, photo-electric current cannot flow. This certain minimum frequency at and above which photoelectric current starts is called as threshold frequency ( 0 ). Threshold frequency is differs for different metals. Wavelength of light corresponding to threshold frequency is called as threshold wavelength (λ0)

2. Now, frequency (greater than threshold frequency) & potential difference are kept constant. It is observed that photoelectric current increases as intensity of incident radiation increases. Photoelectric current is directly proportional to intensity of incident radiations.

3. Now frequency (greater than threshold frequency) & intensity incident radiation are kept constant

It is observed the photo-electric current stops at certain -ve potential. This value of potential is called as stopping potential (Vs). It is also observed that value of stopping potential increases as the frequency of incident radiation increases. The relation between kinetic energy (K.E.) and stopping potential (Vs) is K.E.=Vs.e

4. As soon as light radiation incident on photo sensitive material, electron emission starts and current flows. That means photoelectric effect is an instantaneous process. Keep on visiting www.ednexa.com for more information. -Team Ednexa

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