L I G H T • Light carries energy • A light source (sun, light bulb) gives off light waves www.howstuffworks.com/ light-bulb.htm
Light waves … • Are like the ripples in water when you drop a rock in it • Go out in all directions • Are called electromagnetic waves
Light Wave Lengths are… • The distance between the tops of two adjacent ripples
Frequency is… • The number of wave lengths that pass a point in one second. These are some examples of different wavelengths.
Electromagnetic Spectrum • Electromagnetic waves are classified according to their wave lengths and frequencies • There are many light waves that we cannot see • We can only see a very small part of the electromagnetic waves
Electromagnetic Waves • As the wave length decreases the frequency increases this decides what we can see.
Questions • What is a light wave? • What is a light wave length? • What is meant by the frequency of a wavelength? • How are electromagnetic waves classified? • How much can we see of the electromagnetic spectrum of light?
Works Cited • Imagine the Universe • http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html • electromagnetic wave lengths • NASA: Imaginers • http://imagers.gsfc.nasa.gov/ems/waves2.html • Animated wave lengths • Visible light graphics • Site Format • http://www.siteformat.com/tutorials/photoshop/misc/waterripples.html • blue ripple image • Google • http://images.google.com/images?q=light+bulb&svnum=10&hl=en&lr=&ie=UTF-8&oe=UTF-8&start=100&sa=N • Light bulb picture • Google • Sun picture • www.howstuffworks.com/ light-bulb.htm • light bulb graphic • Science Voyages: Earth & Physical Sciences • Glencoe /McGraw-Hill, 2001 Columbus, Ohio • pg. 786-789