Electromagnetic waves

Electromagnetic waves
Electromagnetic waves are waves that are created as a result of vibrations between an electric field and a magnetic field.
Properties of electromagnetic waves
Electromagnetic waves are transverse waves
Electromagnetic waves can travel through vacuum
Electromagnetic waves transfer energy from one place to another
Electromagnetic waves travel at the same speed of 3.0x10^8m s^-1 in vacuum
The wave speed equation is wave speed= frequency of the wave x wavelength of the wave and it is applicable to all electromagnetic waves
When an electromagnetic wave travels from one medium to another, its speed and wavelength change but its frequency does not change
Electromagnetic waves obey the laws of reflection and refraction
Electromagnetic waves carry no electric charge
Application of electromagnetic waves
Radio waves ( Radios, over-the-air television and communications)
Microwaves (microwave ovens, satellite television and global positioning system)
Infrared radiation (remote controllers, ear thermometers and intruder alarms)
Visible light (optical fibres)
Ultraviolet radiation (sunbeds and sterilisation of equipment)
X-rays (radiation therapy and imaging)
Gamma rays (radiation therapy)
Effects of electromagnetic waves
Infrared heating
Ionisation and damage to living cells