1. Longitudinal
Transverse

2. Electromagnetic Spectrum
Wave
Transverse
Longitudinal
Eg. Sound
Eg. Light
A component of
Electromagnetic Spectrum

3. Electromagnetic Spectrum
Light is just a component of the Electromagnetic (EM) Spectrum
There are altogether 7 components in the spectrum

4. 7 main components in the EM spectrum
Gamma-ray
X-ray
Ultra-violet
Infra-red
Micro wave
Radio wave
Violet
Blue
Green
Yellow
Orange
Red
Indigo

5. Frequency
Frequency =
no. of complete wave in 1s
Higher
Lower
Wavelength
Wavelength
Shorter
Longer
Gamma-ray
X-ray
Ultra-violet
Infra-red
Micro wave
Radio wave

6. Gamma-ray
X-ray
Ultra-violet
Infra-red
Micro wave
Radio wave

7. Shortest to Longest wavelength
Gamma-ray
X-ray
Ultraviolet
Visible Light
Infrared
Microwave
Radio wave

8. Properties EM waves are all transverse wave
The speed of all the EM wave in vacuum is the same
How fast is the speed of light in vacuum?
Speed of Light = 3 x 108 m/s
Speed of all the EM wave = 3 x 108 m/s

9. Properties & Application
Name
Properties
Application
Gamma-ray
Penetrate matter
Kill cancer cells
X-ray
Less penetrating than Gamma-ray
Take “pictures” of bones in the body
Ultraviolet
Given off by the Sun in large quantities
Detect counterfeit notes
Visible Light
The only EM waves visible to our eyes
Enables us to see things
Infrared
Produced by all objects with temperature higher than 0 Kelvin (-273oc)
Heating
Microwave
Generated by extremely high frequency electric current
Cooking in microwave
Radio wave
Generated by high frequency electric current
TV & radio broadcasting

10. Ultraviolet
X-Ray

11. Visible Light
Infrared
Gamma Ray

12. Microwave
Radio wave

13. which kind of wave has the highest energy?
Conclusion
Waves in EM Spectrum are all transverse waves.
They travel at the same speed, 3 x 108 m/s, in vacuum
Gamma-ray
X-ray
Ultra-violet
Infra-red
Micro wave
Radio wave
which kind of wave has the highest energy?