# Waves

#### Chapter 9 - Waves

In the GCE A Levels, we are required to understand several different ways to classify waves, including mechanical waves, electromagnetic waves, progressive waves, stationary waves, transverse waves and longitudinal waves. This video will briefly describe these, and also look at the electromagnetic spectrum.

Waves can be represented using a displacement-time axis. This shows the motion of a single wave particle over time and it actually performs simple harmonic motion. The GCE A Levels requires us to recognise this representation and this video will discuss this.

Waves can be represented using a displacement-distance axis. This shows the entire wave at one instance. The GCE A Levels requires us to recognise this representation and this video will discuss this.
In the GCE A Levels, you will be required to calculate the phase difference between two coherent waves, or the phase difference between two points on a wave. This video will discuss this.
In the GCE A Levels, we must understand the representation of longitudinal waves. This video will discuss this, and also show how to visualise a longitudinal wave using a transverse representation. Longitudinal waves also create pressure variations and this will be mentioned as well.
Intensity is a new concept in the GCE A Levels. This video will describe intensity, and how it defers depending on the radiation pattern of the power source. In addition, the relationship between intensity and amplitude of the wave will also be discussed.
In the GCE A Levels, we have to understand the polarisation of waves. This video will introduce polarisation, discuss Malus’ Law, and also show how the angle of polarisation affects the intensity of the polarised wave.