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TransverseTransverseLongitudinalLongitudinal
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WaveWave
TransverseTransverseLongitudinalLongitudinal
Eg. SoundEg. Sound Eg. LightEg. Light
A component of Electromagnetic Spectrum
A component of Electromagnetic Spectrum
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Electromagnetic Spectrum
• Light is just a component of the Electromagnetic (EM) Spectrum
• There are altogether 7 components in the spectrum
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7 main components in the EM spectrum
Gamma-ray
X-rayUltra-violet
Infra-red
Micro wave
Radio wave
Violet Blue Green
Yellow
Orange
RedIndigo
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Gamma-ray
X-ray Ultra-violet
Infra-red
Micro wave
Radio wave
Wavelength
LongerShorter
Frequency
LowerHigherFrequency =
no. of complete wave in 1s
Wavelength
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Gamma-ray
X-ray Ultra-violet
Infra-red
Micro wave
Radio wave
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Shortest to Longest wavelength
1. Gamma-ray
2. X-ray
3. Ultraviolet
4. Visible Light
5. Infrared
6. Microwave
7. Radio wave
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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
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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
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UltravioletUltraviolet
X-RayX-Ray
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Gamma RayGamma Ray
InfraredInfrared
Visible LightVisible Light
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MicrowaveMicrowave
Radio waveRadio wave
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ConclusionConclusion
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
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