Electromagnetic Spectrum
- Created by: Katinn
- Created on: 02-11-21 13:16
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- Electromagnetic Spectrum
- All electro magnetic waves share several properties:
- They are all transverse
- The can all travel through a vacuum
- They all travel at the same speed in a vacuum
- Do not need a medium
- The speed of electromagnetic waves
- The speed of light in a vacuum is approximately 3x10^8 m/s
- The speed of light in air is approximately the same
- As speed is constant for all electromagnetic waves, as wavelength decreases, frequency must increase. The higher the frequency of an EM wave, the greater its energy.
- Lower energy, long wavelength, low frequency.
- Higher energy, short wavelength, high frequency.
- Visible light
- Infrared
- Mircrowave
- Radio
- Radio waves are used for radio and television communications.
- They have a long wavelength and are reflected by the ionosphere.
- Radio waves are used for radio and television communications.
- Microwaves are used fro satellite communication and microwave oven.
- They pass through the ionosphere and penetrate deep into food.
- Radio
- Infrared radiation is used in remote controllers and infrared cameras
- Mircrowave
- Ultraviolet
- X-Ray
- Gamma Ray
- Gamma radiation is used in medical treatment due to its high energy
- X-rays are used in medical imaging and in security because they can penetrate material easily.
- Gamma Ray
- Ultraviolet light is used in tanning beds.
- X-Ray
- Visible light is used in fibre optics
- Infrared
- Hazrds (disadvantages of electromagnetic waves).
- Too much exposure to Ultraviolet light skin increases the risk of skin cancer.
- X-rays and gamma rays are ionising radiation that can cause mutations leading to cancer
- Microwaves can space internal heating of body tissues.
- Infrared radiation can cause skin burns
- Advantages of using electromagnetic waves
- Depending upon the electrochemical device used, you don't need an external electrical source to generate power.
- You can generate either AC or direct- current (DC) electrical power.
- When an electrical field collides with a magnetic field, electromagnetic waves are produced.
- To dectect EM waves antennas, conducting rods are conducting loops are used.
- All electro magnetic waves share several properties:
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