## 3.01 use the following units: degree (°), hertz (Hz), metre (m), metre/second (m/s) and second (s)

the units for:

angle = degree (°)

frequency = hertz (Hz)

wavelength = metre (m)

velocity = metre/second (m/s)

time = second (s)

the units for:

angle = degree (°)

frequency = hertz (Hz)

wavelength = metre (m)

velocity = metre/second (m/s)

time = second (s)

__Transverse Waves:__

- A wave that vibrates or oscillates at right angles (perpendicular) to the direction in which energy is transferred/ the wave is moving.
- g. Light

Longitudinal Waves:

- A wave that vibrates or oscillates at parallel to (along) the direction in which energy is transferred/ the wave is moving.
- g. Sound

__Key Definitions:__

- Wavefront: Created by overlapping lots of different waves. A wavefront is where all the vibrations are in phase and the same distance from the source.
- Amplitude: The maximum displacement of particles from their equilibrium position.
- Wavelength: The distance between a particular point on one cycle of the wave and the same point on the next cycle.
- Frequency: The number of waves passing a particular point per second. Is measured in Hertz (Hz).
- Time Period: The time it takes for one complete wave to pass a particular point.

Waves can transfer energy and information with out transferring matter, for example sun light, it transfers energy as it makes the earth warm without bringing any matter.

wave speed (m/s) = frequency (Hz) x Wavelength (m)

Frequency (Hz) = 1/ Time Period (s)

You will need to use any of the in 3.05 and 3.06 to solve problems to do with sound waves and electromagnetic (light) waves