Electrical

1. ELECTROMAGNETIC WAVES
Presented By
Abu Mohammad Fazlay Rabby
152-33-2619
Mousumi Nargish
152-33-2649

2. WHAT ARE EM WAVES?
Electromagnetic waves (EM waves for short)
are waves that can travel in a vacuum.
These waves are created by the vibration of
an electric charge.

3. Electromagnetic Spectrum
It is a group of different electromagnetic
waves.
There are 7 components in the spectrum.

4. Electromagnetic Spectrum
Gamma rays
X – rays
Ultraviolet
Visible light
Infra-red
Microwaves
Radio waves
Highest frequency
Shortest wavelength
Lowest frequency
Longest wavelength

5. Uses of Gamma Rays
Kill cancer cells
Study the nucleus in
atoms.

6. Uses of X-rays
Take ‘pictures’ of
bones in the body
Check for any cracks
in metal plates

7. Uses of Ultraviolet
Detect forged notes
Sun-tanning
Medical equipment.

8. Uses of Visible Light
Enable us to see
things
Photosynthesis in
plants

9. Uses of Infra-red
Heating
Haze photography

10. Uses of Microwaves
Radar communication
Telephone
communications

11. Uses of Radio Waves
Radar communications
TV and radio broadcasting

12. Common Properties of EM Waves
All travel at the speed of light. (3*108 m/s)
Can travel through solid, liquid, gas and
vacuum
Obey the laws of reflection and refraction
All can be absorbed and emitted by matter
The wave equation is applicable to all

13. Thank you