Electromagnetic Spectrum

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Created by: cjohn12
Created on: 16-04-18 14:23

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Electromagnetic Spectrum
- in a vacuum
  - light, and radiation travel at the same speed
    - 2.997 925 x10^8 ms^-1
      - This is usually denoted as the letter 'c'
    - For every frequency of radiation you can calculate the corresponding wavelength
      - speed of light = frequency of radiation X Wavelength in vacuum
- Inverse square law
  - Waves transfer energy
    - Waves are propagated from a point. This point will be spherical
      - PROPAGATED = spread put
      - surface are of a sphere is 4xPixR^2
      - Intensity of the wave is shown in the formula
    - Energy is a quantity that is always conserved
Waves are propagated from a point. This point will be spherical
- PROPAGATED = spread put
- surface are of a sphere is 4xPixR^2
- Intensity of the wave is shown in the formula
I = K/R^2
- I = intensity of wave
- R = distance from source
Your eyes can detect a very small range of frequencies.
- This range is called visible light
- Reigons
  - Electromagnetic Spectrum
    - in a vacuum
      - light, and radiation travel at the same speed
        2.997 925 x10^8 ms^-1
        This is usually denoted as the letter 'c'
        
        For every frequency of radiation you can calculate the corresponding wavelength
        speed of light = frequency of radiation X Wavelength in vacuum
    - Inverse square law
      - Waves transfer energy
        Energy is a quantity that is always conserved
  - You can sense frequencies just a little lower then the red of light as heat warming.
This is called infra-red radiation
- You can sense frequencies just a little lower then the red of light as heat warming.
The frequencies that can not be seen by humans but by other animals such as bees which help plants grow and cause sunburn.
- This is called Ultra-Violet
- Reigons