In this topic we look at:

- oscillations of bodies that move back and forth periodically
- progressive waves that transfer energy and information through space
- the interference effects of these progressive waves, and other phenomena
- standing waves, where waves combine to become stationary (and therefore transferring no energy at all)

You will learn about simple harmonic motion, dispersion and guitar string frequencies, and be able to answer the following questions:

- How does a force that is proportional to displacement result in an oscillation?
- Are all oscillations simple harmonic?
- What is the connection between oscillations and waves?
- Are waves really made of an infinite number of wavelets?

### Oscillations

An oscillation is a movement through a full cycle.

### Waves

If you line up a lot of pendulums and start them swinging at different times you get a wave pattern, this leads to our mathematical model of all waves.

### AHL Waves

What is the Doppler effect? What are the equations for simple harmonic motion? How is the diffraction pattern formed for light passing through a single slit? What affects the interference patterns for two or more slits? What is thin film interference?