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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
Light interacts with matter in 4 known ways. It sometimes bounces off matter. Sometimes it is absorbed by matter. In some cases it passes through.
Electromagnetic Waves and Light. Electromagnetic Waves Electromagnetic waves do not require a medium to travel. They are created by oscillating (moving)
The Electromagnetic Spectrum The Nature of Electromagnetic Waves Waves of the Electromagnetic Spectrum Producing Visible Light Wireless Communication Table.
By Will B. Electromagnetic waves The different waves that make up the electromagnetic spectrum are as follows in order of increasing frequency; Radio.
Fun Physics You Can See Lasers, Holograms and Spectroscopy Visit For 100’s of free powerpoints.
Excited Elements. Introduction As electrons absorb energy they become excited and move to higher energy levels. This energy is released in set amounts.
ENERGY UNIT 4. Light energy : mostly comes from the sun. We can use torches and candles. Thermal energy: provides from the sun and fossil fuels (coal,
Bellringer What is the relationship between an object and the sound waves it creates during a sonic boom?
Waves, Sound, and Light Chapter 3. Bell Work 11/29/10 Please get a new bell work sheet. Write each statement then decide if they are true or false, if.
Believe it or not, you are being “showered” all the time, not by rain but by waves. popcorn cell phone.
Light as a Wave Part 2 SNC2D. The Speed(s) of Light Light will travel slower in denser media (e.g. glass), but the speed in air is still effectively 3.0.
Astronomy Notes to Accompany the Text Astronomy Today, Chaisson, McMillan Jim Mims.
Chapter 18 Electromagnetic Waves. Ch 18.1 – Electromagnetic Waves A.Electromagnetic Waves are produced by charged particles in motion 1. They can travel.
Production of X-rays (1) X-rays are produced when rapidly moving electrons that have been accelerated through a potential difference of order 1 kV to 1.
The Beginning of the Quantum Physics Blackbody Radiation and Planck s Hypothesis.
Why Does an Apple Look Red? Title your paper, and record each of your observations.
Chapter 3 States of Matter. Everything that has mass and volume is called matter.
1 PH300 Modern Physics SP11 2/22 Day 11: Questions? Photons Atomic Spectra Thursday: Lasers(!) All these fifty years of conscious brooding have brought.
Waves and the Electromagnetic Spectrum Ch. 17. What is an electromagnetic wave? A transverse wave A wave that consists of vibrating electric and magnetic.
Matter: Its what the worlds made of. What do you know about matter? Solid s Liquids Gasses Plasma.
Lots of fun! Win valuable prizes!. 1. The main difference between a radio wave and a light wave is its A. wavelength. B. speed. C. Both A and B D. None.
Matter: It’s what the world is made of. What is matter? Matter is anything that has mass and takes up space.
WAVES IN ACTION The Electromagnetic Spectrum What Is The Electromagnetic Spectrum? We are all familiar with LIGHT Light is part of the EM spectrum –
An Introduction to Light. What is light? Sun is our closest star Source of all energy on Earth Energy produced by nuclear reactions in core reach Earth.
Chapter 8 Heat Transfer & Change of Phase. Heat Transfer How does the energy move from a hotter to a colder object? How does the energy move from a hotter.
How atoms produce light
Electromagnetic Spectrum © 2000 Microsoft Clip Gallery.
Copyright © Houghton Mifflin Harcourt Publishing Company Unit 3 Lesson 1 The Electromagnetic Spectrum.
UCSD Physics 10Light Color Color Addition & Subtraction Spectra.
Quiz Electromagnetic spectrum. Using the quiz … Click through the quiz to see the questions and answers. Remember it is MUCH better to try to think of.
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