2 What is a wave? - a repeating disturbance or movement that transfers energy through matter or spaceExamples:ocean waveslightsound
3 Waves travel through matter - this is called the MEDIUM Mediums can be - solid (earth)- liquid (water)- gas (air)Light and radio waves travel through space and do not need a medium.
4 Electromagnetic Waves these are made by vibrating electrical charges that can travel through space where matter is not presentThey do NOT require matter to move through
5 Transverse Waves - medium moves at a right angle to the direction of the wave (like in the ocean) Compression waves - medium moves along the same direction as the wave, visualize a coiled spring.
6 The Parts of a Transverse Wave The high part of the wave is the CRESTThe low part of the wave is the TROUGH
7 The Parts of a Transverse Wave Wavelength = the distance from one point of the wave to the next point (from crest to crest, or from trough to trough)
8 The Parts of a Transverse Wave FREQUENCY = number of waves that pass a point in a secondFrequency is measured in hertz (Hz)Each wave has a PERIOD, which is the amount of time it takes for one wavelength to pass a point
9 If you make transverse waves by moving a rope up and down, you can increase the frequency by moving the rope faster. This makes the wavelength SHORTER high frequency = short wavelength low frequency = long wavelength
10 Wave Speed - how fast a wave travels Speed (m/s) = frequency (Hz) x wavelength (m) Greek letter lambda is used to represent wavelength
11 Wave AmplitudeAmplitude is related to the amount of energy a wave carries.Tighter packed coils of the slinky will cause greater energy.In the rope, raising the hand higher and causing "bigger" waves increases the amplitudeAmplitude = height of wave