Electromagnetic Waves
- Created by: adelaide
- Created on: 13-01-13 10:03
View mindmap
- Electromagnetic Waves
- the electromgnetic spectrum
- Wave Speed= frequency x wavelength
- v=f x ?
- Electromagnetic waves are electric and magnetic disturbances that transfer energy from one place to another
- Wave Speed= frequency x wavelength
- Light, Infrared, microwaves and radio waves
- white light contains all the colours in the spectrum
- Infrared Radiation
- absorbed by skin, damages cells
- The hotter an object= more infrared radiation
- optical fibres, remote control handsets, scanners and infrared cameras
- Microwaves
- Radiowaves
- Have a longer wavelength but smaller frequency
- carry radio, tv and mobile phone signals
- bluetooth and wireless networks use radio waves
- Communications
- radiowaves of different frequencies are used for different purposes
- affects: how far they can go. how much the can spread. how much info they carry
- radiowaves of different frequencies are used for different purposes
- The expanding Universe
- The red-shift of a distant galaxy is moving away from us
- The faster a distant galaxy is moving away from us, the < the redshift
- all distant galaxies show a red shift
- All galaxies are moving away from us= universe expanding
- RED SHIFT= increase in wavelength of em waves emitted by a star
- BLUE-SHIFT= decrease in the wavelength of em waves emitted by a star
- The red-shift of a distant galaxy is moving away from us
- The Big Bang Theory
- Universe has been expanding ever since
- Cosmic microwave background radiation can only be explained by The Big Bang Theory
- CMBR created as high gamma radiationits now microwave radiation
- the electromgnetic spectrum
- Radio, Micro, Infrared, Light, Ultraviolet, X-rays, Gamma
- the electromgnetic spectrum
- Wave Speed= frequency x wavelength
- v=f x ?
- Electromagnetic waves are electric and magnetic disturbances that transfer energy from one place to another
- Wave Speed= frequency x wavelength
- Radio waves have the biggest wavelength,
- Gamma radiation have the smallest wavelength
- the electromgnetic spectrum
- The hotter an object= more infrared radiation
Comments
No comments have yet been made