Chapter 4 - Light. Name: Block:

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1 Chapter 4 Notes: Light Name: Block:

Properties of Waves Waves are a repeating disturbance or movement that energy through matter or space without causing any displacement of material Features of a wave: 1) Wavelength the distance from

2 Properties of Waves Waves are a repeating disturbance or movement that energy through matter or space without causing any displacement of material Features of a wave: 1) Wavelength the distance from crest to or from trough to 2) Amplitude the of a wave crest or depth of a wave trough 3) Frequency the number of repetitive motions, or oscillations, that occur in a given time, measured in (1 cycle per second = 1 hertz) Label the rest position, wavelength(2), crest, trough, and amplitude: The inverse relationship between wavelength and frequency: 1) The wavelength of a wave decreases as the frequency. 2) The wavelength of a wave increases as the frequency. Which diagram has the lowest frequency? (a or b) highest frequency? (a or b) shortest wavelength? (a or b) longest wavelength? (a or b)

Types of Waves: 1. Compression Waves a wave in which matter in the medium moves back and forth along the direction that the wave travels (travels through solid, liquids, or gases) 2.

3 Types of Waves: 1. Compression Waves a wave in which matter in the medium moves back and forth along the direction that the wave travels (travels through solid, liquids, or gases) 2. Transverse Waves a wave in which matter in the medium moves at angles to the direction that the wave travels (travels through solids only) Visible Light Visible light is the mixture of all the _ of the rainbow. The wave model of light says light is a type of that travels through empty and transfers from one place to another. The Visible Spectrum is made up of different, each having its own (about nm) Red has the wavelength, about 700 nm, while violet has the, about 400 nm. V I B G Y O R R O Y G B I _ V

$Refraction and Reflection: Refraction is the bending or changing of a wave as it changes speed in moving from one material to another Reflection is the visible effect when light strikes an object and$

4 Refraction and Reflection: Refraction is the bending or changing of a wave as it changes speed in moving from one material to another Reflection is the visible effect when light strikes an object and off. How do we see colour? When sunlight strikes something coloured, some colours are reflected while other colours are absorbed. Only the colours can be seen. (e.g. a blue shirt reflects light) Additive primary colours The three additive primary colours are,, and _. Adding these three colours makes white light: red + green + blue = Secondary colours Each secondary colour is created by combining two of the primary additive colours: blue + green = green + red = red + blue =

5 Electromagnetic Radiation Electromagnetic radiation is the transmission of energy in the form of waves or rays, from the longest waves to the shortest rays 1) waves (AM, TV, FM) -have the longest wavelength and lowest energy and frequency -used in magnetic resonance imaging (MRI) and broadcasting of radio and television 2) -waves -a type of radio wave -are strongly absorbed by water particles -used in telecommunications and radar 3) waves -referred to as heat radiation -used in remote controls, computers, heat lamps, and observation satellites (LANDSAT) 4) light -the wavelengths we can see (ROY G BIV) 5) waves -causes sunburns and skin cancers -helps to make Vit D, used in forensics, used to kill bacteria 6) rays -used to photograph teeth and bones, and in air port screening devices 7) rays -the highest energy and frequency and shortest wavelength -result from nuclear reactions and distant galaxies -used in radiation therapy to kill cancer cells

6 Flashcards 1) 2) What is the inverse relationship between wavelength and frequency? What are the 3 main parts of a wave? 3) 4) What is a compression wave? What is a transverse wave? 5) 6) What is the wave model of light? What is the visible spectrum? 7) 8) What is refraction? What is reflection?

9) 10) What are additive primary colours?

7 9) 10) What are additive primary colours? 11) 12) What are the secondary colours? 13) What is the electromagnetic spectrum? 14) What are radio waves? What are microwaves? What are infrared waves? 15) 16) What is visible light? What are ultraviolet (UV) waves?

8 17) 18) What are X rays? What are gamma rays

Properties of Waves. Before You Read. What are the features of a wave?

Properties of Waves. Before You Read. What are the features of a wave? Properties of Waves Textbook pages 134 143 Before You Read Section 4.1 Summary In this section, you will find out about waves, such as water waves, sound waves, and radio waves. On the lines below, list