1. Properties of Waves

2. What Are Some Types of Waves?
Microwaves
Waves of water
Light waves
Sound waves
Hopefully not this one…

3. Some Important Terms
A wave is a disturbance or movement that transfers energy through space or through matter
Ex: sound waves transfer energy through air

5. Some Important Terms
Energy is the capacity to apply force over a distance
A force is a PUSH or a PULL on an object

6. Some Important Terms Let’s look at a wave of water:
The rest position (equilibrium position) is shown by a line.
The highest point is called the crest
The lowest point is called the trough

7. Some Important Terms
The wavelength is measured from crest to crest or trough to trough.
Wavelength is a distance and it is measured in metres.

8. Some Important Terms
Amplitude is the height of a crest or depth of a trough measured from the rest position.
Ex: A big wave with a high crest and low trough has a large amplitude.

9. Some Important Terms
The rise and fall of each wave is called an oscillation or a vibration.
Frequency is the number of repetitive oscillations that happen in a given time.
It is usually measured in Hertz (Hz) or cycles per second.

11. Water Waves Move Energy
A water wave moves energy (not matter or water).
Energy is carried forward by the water wave.
If you are sitting on an inner-tube in the lake, the wave passes underneath you.
The water does not move forward.

13. What Do Waves Travel Through
The matter that waves travel through is called a medium.
Ex: sound waves travel through air
Air is the medium
Ex: ocean waves travel through
water
- Water is the medium

14. 2 Types of Waves 1) Transverse Waves 2) Compression Waves
Matter in the medium moves up and down perpendicular to the direction that the wave travels (ex: waving a rope)
2) Compression Waves
Matter in the medium moves back and forth along the same direction that the wave travels (ex: sound waves)

16. Compression

18. Sonic Compression Wave

19. Did you know??
Not all waves need a medium…light waves in space can travel through the emptiness of space (there is no matter at all!)
But sound waves DO need a medium to travel through which means there is no sound in space!