Physical Science: Optics

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Presentation transcript:

Physical Science: Optics Outcome C1

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

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

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

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

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

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)

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

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

Bill Nye! Video on waves