Electromagnetic Waves

Submitted to :
Dr. Kashif shb
Submitted by:
Muhammad Nadeem
Roll No:
bsf1800584
University of education , Lahore.

Electromagnetic Waves
 If you have ever tuned in to listen to a radio , a spoken
headphone , turned on a light , hand on X ray taken, felt the
warmth of the sun on your skin.
 You have experienced ELECTROMAGNETIC WAVES.

Definition
 “Electromagnetic waves are the waves which do not require
any medium for their propagation.
 These are formed when an electric field couples with a
magnetic field.
 The electric and magnetic fields of an electromagnetic wave
are perpendicular to each other and to the direction of waves.”

How do moving charges create magnetic fields?
 Any moving electric charge is surrounded by an electric field
and a magnetic field.

Production of E.M Waves :
 when an electric charge vibrates , the electric field around it
changes a magnetic field.

 The electric and magnetic fields vibrate at right angles to the
direction of wave travels so it is a transverse wave.

What is the speed of E.M Waves ?
 All E.M waves travel with speed 3*10^8 m/s
 E.M waves usually travel slowest in solids and fastest in
gases.

Properties of E.M waves :
 All the E.M waves are transverse.
 they do not require any medium to travel though.
 they travel at speed 3*10^8 m/s in vacuum.
 they can be reflected and refracted.
 they can all be emitted and absorbed by matter.

Graphically Representation:

Chart of wave length and frequency:

What question do you have?