Medium- A medium is a substance that transfer energy.
Wave of Energy- Move from one place to another.
Transverse Wave- Moving particles that move in a right angle motion.
Compression Wave- Particles that move backwards and forwards.
Frequency- A number of vibrations per second in a wave.
Wavelength- The distance between the waves tops.
Amplitude- The distance each particle moves.
Electromagnetic Spectrum- Made up of all the electromagnetic waves. It is arranged in the wave frequency and wavelength.
Visible Light- The only EM waves we can see with the human eye. Are waves as the colours of the rainbow.
Infrared Radiation- Cannot been seen by the naked eye. It is seen by all objects and is usually sensed as heat.
Ultra-Violet Radiation- Ultraviolet radiation is needed by humans to help the body produce vitamin D.
Electromagnetic Waves- The number of times per second that a new electric or magnetic force is generated.
Microwaves - Is an electromagnetic wave with a wave length that heats up foods ect.
Coaxial cables - Is a type of cable that is used by modern day appliances like TVs.
Reflection- When light bounces off the surface of a substance into the same medium.
Refraction- Refraction can occur when there is a change in the speed of light as it passes from one substance/medium to another.
Concave- Caves inwards.
Convex- Bulges outwards.
Compressions- Air particles closer together than usual.
Rarefactions- Air particles further apart than usual.
Sound waves- Are a combination of compressions and rarefactions.
Reverberation- When sound is reflected over and over again.
Radio waves- They occur at different frequencies.
Transmitter - Uses a message and encodes/transmits it with radio waves.
AM- Amplitude Modulation.
FM- Frequency modulation.
Wireless communication- Transfers information between two sources.
Optical fibres - A fibre that can be transmitted.
Satellite dishes- A bowl-shaped object that transmits signals.