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Sunlight Plasma at extremely high temperatures. 6,000 ºC Outer 1.5x10 7 ºC Inner [http://www.astronomy.com/asy/objects/images/sun_full_disk_soho_09_14_1997.jpg]
Rather uniform spectrum of colors [http://www.videoessentials.com/images/res_spectral12.gif]
Incandescent Light These heat a piece of metal until it produces light. The thin piece of metal is called a filament.
[http://www.videoessentials.com/images/res_spectral12.gif] Mainly red/orange/yellow in spectrum of incandescent lights
Incandescent Light About 80% of the energy used is converted to heat (infrared).
Fluorescent Lights A glass tube is covered with phosphors that give off light when UV rays from the gas inside are given off.
[http://www.videoessentials.com/images/res_spectral12.gif] Mainly blue/green in spectrum of fluorescent lights
Fluorescent Lights Uses one-fifth the energy of an incandescent light bulb. Can contain mercury so must be recycled after use.
Neon Lights Electricity is passed through a glass tube filled with gas, and the particles collide and give off light.
This creates an emission spectrum of “lines” at certain colors [http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/modpic/neoncomp.jpg]
Lasers Atoms of a gas are charged with energy and they in turn all give off light with the same wavelength.
Lasers Used in medicine and in reading optical data (CD’s, DVD’s)
Tungsten-Halogen Lights The filament is made of the Tungsten which can create a tremendous amount of heat, and light. [http://www.daviddarling.info/images/tungsten_halogen_lamp.jpg]
Has a rather uniform spectrum and is somewhat energy efficient. [http://www.molecularexpressions.com/primer/lightandcolor/images/lightsourcesfigure3.jpg]
Sodium-Vapor Lamps Sodium metal becomes very hot and changes to a vapor to produce yellow- orange light. [http://upload.wikimedia.org/wikipedia/en/6/63/Na-lamp-2.jpg]
Can be used outdoors to reduce light pollution at night. [http://www.sao.arizona.edu/FLWO/LIGHT/MontePatria2.jpg]
Uses of Light Polarizing Filters Only light waves that are vibrating in one direction pass through. Used in sunglasses to block “glare”
Uses of Light Optical Fibers Light waves pass through a glass tube for communication purposes. Telephone, TV, Internet
Total Internal Reflection allows the light waves to “travel” through the tube. Click here for a demonstration
18.5 Sources of Light Objects are invisible in the dark because no light is available to reflect off them. But some things, such as flashlights and fireflies,
Producing and Using Light. Producing Light Incandescent light: creating light by heating a piece of metal until it glows Example: Light bulbs.
Section 3 Section 3 Producing Light Incandescent Lights Most of the lightbulbs in your house probably produce incandescent light, which is generated by.
12.3 Essential Questions What are the advantages and disadvantages of different lighting devices? How does a laser produce coherent light? What are some.
Light Chapter 13. Ch13 Sec 1 The Behavior of Light.
Light. What you see depends on the amount of light in the room and the color of the objects. For you to see an object, it must reflect some light back.
Light Chapter 12. Light and Matter Objects can absorb, reflect, or transmit light Depends on what material the object is made up of Typically, “shiny”
The electrons within atoms are the sources of all light.
Light and Color. Light and Matter Objects can absorb, reflect and transmit light Opaque – Only absorbs and reflects light – No light passes through.
LIGHT. The spectrum consists of all wavelengths of electromagnetic energy. Visible light is only a small portion of this spectrum. The range of visible.
Producing Visible Light EQ: How is visible light produced?
Waves? Chapter 17 Notes. Chapter 17 The Nature of Electromagnetic Waves Electromagnetic waves are transverse waves that transfers changing electrical.
Technology that Produces Light 1. Incandescence – when objects are heated enough, they glow. Ex. Incandescent Light Bulbs – electricity heats up metal.
IPC Notes The Behavior of Light. Light & Matter Opaque material – either absorbs or reflects all light; you can’t see through it ex) a brick wall.
The Nature of Electromagnetic Waves 1.Electromagnetic Waves – Transverse waves that consist of changing electric and magnetic fields. 2.Electromagnetic.
Fluorescent Lamps. Question: A fluorescent lamp tube is coated with a white powder on its inside surface. If that powder were not there, would the lamp.
Electromagnetic Spectrum and Light Chapter 18. Electromagnetic Waves Transverse Waves Transverse Waves Consist of constantly changing fields Consist of.
Types of Light Emissions Luminous: an object that emits/produces its own light (eg. sun) Non-luminous: an object that do not produce its own light and.
Unit 4: Optics Sources and Nature of Light There are many different types of light. Some light is due to natural sources like the sun. Other forms.
Producing Visible Light. Light produced by the Sun or other stars is called NATURAL light. Light produced through human technology is called ARTIFICIAL.
Class Starter 1. How does the amount of energy in the electromagnetic spectrum change as you travel from radio waves to gamma rays? 2. Besides cooking,
1. Key Ideas: Light is produced by a variety of sources, both natural and artificial. Light may be reflected, transmitted, or absorbed, depending on the.
Light 3-3 Illuminated- object that can be seen because it reflects light Luminous- object that gives off its own light Common types of lights: IncandescentFluorescentNeon.
Light A guide to Electromagnetic Waves. Electromagnetic Radiation Electromagnetic waves are transverse waves made from electrically charged particles.
© 2014 Pearson Education, Inc. Chapter 5 Lecture Basic Chemistry Fourth Edition Chapter 5 Electronic Structure and Periodic Trends 5.2 Atomic Spectra and.
17.1: Electromagnetic waves have unique traits Electromagnetic waves: –A disturbance that transfers energy through a field. –Also called EM waves –Most.
Lighting System A lighting system consists of : 1.Light sources 2.Luminaires (or fixtures) 3.Ballasts.
Welcome Back Scientists! Thursday, February 18, 2016 Objective: Properties of Light; I will describe the properties and characteristics of light. Homework:
PHYSICS 103: Lecture 20 Blackbody Radiation Light Bulbs Agenda for Today:
Electromagnetic Waves Section O-3.1. The Nature of Electromagnetic Waves What are Electromagnetic Waves Transfer energy from one place to another Don’t.
Luminous Source produces its own light eg. the sun, a light bulb, a camp fire, a firefly Non-Luminous Source: does not produce its own light.
Setup For Absorption Spectrum Spectroscope (setup for Emission Spectrum)
The Zebrafish are emitting light when exposed to ultraviolet light. Salton Sea in California has algae that emit light giving it this glow.
Black-Body Radiation A black-body is a material which absorbs any light falling on it. A black-body also radiates! The radiation contains all frequencies,
Discharge Lamps 1 Discharge Lamps Chapter 14 part2 1020C.
Objects can either be: Luminous (produce their own light) ex: Sun Non-luminous can be seen because it is able to reflect light Q: So what are the.
Types of Light Bulbs and Their Uses. Bulbs There are many different types of light bulbs around, and they were all designed with a certain use in mind.
LIGHTING THE WAY Section Vocabulary Energy- the ability to do work or cause a change in matter Electromagnetic radiation- energy in the form of waves.
Optics Light and Applications of Optics. Producing Light (p.278) Luminous objects, such as our Sun, produce their own light Non-luminous objects, such.
E-M Spectrum and Waves Prentice Hall Chapter 18. Chapter Assignments Workbook and E-M Spectrum Activity Book Section 18.1: 535/math practice 1-3 and 538/9,10.
Chapter 16 – Light What type of wave is light? (last chapter)
The Electromagnetic Spectrum The Nature of Electromagnetic Waves Waves of the Electromagnetic Spectrum Producing Visible Light Wireless Communication Table.
Sources of Artificial Light An incandescent light bulb (old type) creates light from a material due to the high temperature of the material called tungsten.
OPTICS – a branch of physics which deals with the behavior of light and other electromagnetic waves.
Chapter 17. Mentally walk through your entire home. Write down every place there is a light. Next, go through your list and write it the light is.
LIGHT Waves carry energy from one place to another © 2000 Microsoft Clip Gallery.
WHAT IS LIGHT? Form of energy (first basic principle of light) that you can see Radiates (spreads out) in all directions Light travels in a straight line.
What is light?. Light Visible light is a form of energy that can be detected by cells in our eyes. Visible light is a form of energy that can be detected.
Light: Electromagnetic Radiation. Important Vocabulary Electromagnetic radiation Photon Radio wave Microwave Infrared radiation Visible radiation.
Ch 18 The Electromagnetic Spectrum. What are Electromagnetic Waves? Electromagnetic waves are transverse waves consisting of changing electric fields.
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