By the end of chapter 4 you will be able to: Learning Goals By the end of chapter 4 you will be able to: Recognize that waves carry energy Describe ways in which water waves can explain properties of light Explain why a prism separates white light into different colours Describe properties and uses of electromagnetic waves. (c) McGraw Hill Ryerson 2007

TPS What do x-rays, sun tanning, the warmth from a candle, TVs, and radios all have in common TPS (c) McGraw Hill Ryerson 2007

What is light? TPS (c) McGraw Hill Ryerson 2007

https://www.youtube.com/watch?v=cfXzwh3KadE EMS video 5 min (c) McGraw Hill Ryerson 2007

Watching Water Waves Activity Activity p134 Watching Water Waves Activity (c) McGraw Hill Ryerson 2007

Watching Water Waves Activity p134 1. In what direction did the waves travel when you tapped the water lightly with the pencil 2. How did the spacing of the water waves change when the rate of the tapping increased (c) McGraw Hill Ryerson 2007

Light is a kind of energy that travels in waves. What is light? Light is a kind of energy that travels in waves. Why is Light important ? Light is a form of energy. We cannot feel light. We can only see it. Light comes from both natural and manmade sources. Sun, lamp, phosphorescence Not: mirrors, moon (c) McGraw Hill Ryerson 2007

Waves with different properties can be used in different ways Why it is important We can see and hear the world around us because of the energy carried by waves. Waves with different properties can be used in different ways Electromagnetic waves can be used to make different kinds of images in the world around us. (c) McGraw Hill Ryerson 2007

Intro to Light Video Ted Ed: https://www.youtube.com/watch?v=O0PawPSdk28 (c) McGraw Hill Ryerson 2007

What are some sources of light? TPS: What are some sources of light? TPS (c) McGraw Hill Ryerson 2007

What are some sources of light? https://www.youtube.com/watch?v=BUYeQa_-ojk TPS (c) McGraw Hill Ryerson 2007

Light is part of the Electromagnetic Spectrum Electromagnetic Spectrum 2min https://www.youtube.com/watch?v=m4t7gTmBK3g The electromagnetic spectrum is the range of frequencies (a spectrum) of electromagnetic radiation (EMR) and their respective wavelengths. (c) McGraw Hill Ryerson 2007

To describe the electromagnetic spectrum, we need to understand properties of waves. (c) McGraw Hill Ryerson 2007

How can we describe light? Light behaves like a wave (c) McGraw Hill Ryerson 2007

Examples of waves include: water waves, sound waves, and microwaves. 4.1 Properties of Waves A wave is a disturbance or movement that transfers energy through matter or space. Energy is the capacity to apply a force over a distance. A force is a push or a pull on an object. Examples of waves include: water waves, sound waves, and microwaves. See page 134 (c) McGraw Hill Ryerson 2007

Identify the parts of the wave (c) McGraw Hill Ryerson 2007

A crest is the highest point on a wave. Features of a Wave A crest is the highest point on a wave. A trough is the lowest point on a wave. The wavelength is the distance, in meters, for one complete cycle of the wave. Crest to crest or trough to trough. The amplitude is the height of a wave crest or depth of a trough, as measured from its rest position. Identify each of the lettered parts of the wave. See pages 135 - 136 (c) McGraw Hill Ryerson 2007

Catch a Wave Activity p139 Workbook p52-53 Practice (c) McGraw Hill Ryerson 2007

https://www.youtube.com/watch?v=R89dJP5v1Tg Bill Nye: Waves (c) McGraw Hill Ryerson 2007

Read pages 134-137 Answer CYU p143 #1, 2, 3, 4, 7, 8. Homework (c) McGraw Hill Ryerson 2007

Activity 4-4 p140 (c) McGraw Hill Ryerson 2007

https://www.youtube.com/watch?v=cfXzwh3KadE EMS video 5 min (c) McGraw Hill Ryerson 2007

In a nutshell, 4.38min https://www.youtube.com/watch?v=IXxZRZxafEQ What is light? In a nutshell, 4.38min https://www.youtube.com/watch?v=IXxZRZxafEQ Also need to know about waves and EMS (c) McGraw Hill Ryerson 2007