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Photoelectric Effect
Chapter Name : Dual Nature Of Radiation And Matter
Sub Topic Code : 101_12_11_03_02
Topic Name : Photoelectric Effect
Sub Topic Name : Hallwachs' And Lenard's Observations
Introduction

In the photoelectric effect, electrons are emitted from matter (metals and non-metallic solids, liquids or gases) as a consequence of their absorption of energy from electromagnetic radiation of very short wavelength, such as ultraviolet radiations.

Pre-Requisites:

Photoelectric effect

Activity:

Video camera and digital cameras work by the principle of photo electric effect.

Real Life Question:

What is electron emission ?

Key Words / FlashCards
Key Words Definitions (pref. in our own words)
Photoelectric effect The photoelectric effect refers to the emission, or ejection, of electrons from the surface of, generally, a metal in response to the incident light.
Learning aids / Gadgets
Gadgets How it can be used
Video camera Video camera tubes in the early days of television used the photoelectric effect.
Real life uses :

Digital cameras. A photon hits the sensor, liberating an electron which is then measured by the camera.

Places to visit :

Studios

Practical examples around us
Examples Explainations
Garden Various plants absorb nutrients and water.
What you learn in Theory:

The photoelectric effect refers to the emission, or ejection, of electrons from the surface of, generally, a metal in response to the incident light.

What you learn in Practice:

It was found that certain metals like zinc, cadmium, magnesium, etc. responded only to ultraviolet light having short wavelength, to cause electron emission from the surface.

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