We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byGerald Greive
Modified over 4 years ago
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
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 Chapter 14 part2 1020C.
Emission of Light from Gases
LIGHT Waves carry energy from one place to another © 2000 Microsoft Clip Gallery.
Electromagnetic Waves Section O-3.1. The Nature of Electromagnetic Waves What are Electromagnetic Waves Transfer energy from one place to another Don’t.
Objects are invisible in the dark because no light is available to reflect off them. But some things, such as flashlights and fireflies, and the light.
Types of Light Bulbs and Their Uses
Ch 18 The Electromagnetic Spectrum
PHYSICS 103: Lecture 20 Blackbody Radiation Light Bulbs Agenda for Today:
Producing Visible Light EQ: How is visible light produced?
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. 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 13.
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.
LIGHT. The spectrum consists of all wavelengths of electromagnetic energy. Visible light is only a small portion of this spectrum. The range of visible.
Chapter 10: Light and Reflection The phosphorescence of algae in the Salton Sea in California.
© 2014 Pearson Education, Inc. Chapter 5 Lecture Basic Chemistry Fourth Edition Chapter 5 Electronic Structure and Periodic Trends 5.2 Atomic Spectra and.
Everyday Light. Optical emission fluorescencephosphorescence.
WHAT IS LIGHT? The Zebrafish are emitting light when exposed to ultraviolet light. Salton Sea in California has algae that emit light giving it this glow.
© 2020 SlidePlayer.com Inc. All rights reserved.