1. Physical Science: Optics
Outcome C1

2. Properties of waves
Light is a type of electromagnetic energy which travels in a wave at the speed of 300, 000 km/s
A wave is the result of a vibration that transfers energy from one location to another

3. Properties of waves A wave has:
Crest – The peak (highest position) of the wave
Trough – The lowest position of the wave
Wavelength – The distance between two adjacent crests, OR two adjacent troughs

4. Properties of waves A wave has:
Amplitude – the distance above or below the resting position
Frequency – the number of wavelengths in a given time
Frequency is measured in Hertz (Hz) which means number of cycles per second

5. Properties of waves
The higher the frequency of a wave, the higher the energy it has
The lower the frequency of a wave, the lower the energy it has

6. QUESTION OF THE DAY If you wish to measure the wavelength of a wave.
How would you do it?

7. Properties of waves 2 types of waves: 1. Compression waves – slinky
These waves move back and forth along the same direction the wave travels
2. Transverse waves – waving rope
These waves move perpendicular to the direction the wave travels
Waves move energy, not matter (substance)

8. Properties of waves Waves can travel in a medium or in the air
A medium can be anything that is a liquid, solid, or gas or a combination of these
For example: Think of when you shine a light into a pond

9. Properties of waves
Refraction – When waves change direction slightly because it has travelled from one medium, into another
Reflection – When waves “bounce off” a surface and changes direction

10. Bill Nye!
Video on waves