Bellwork – draw and label the parts of the wave above You are stranded on a raft in the middle of the ocean. What will happen when a wave passes through the water What is meant by medium? In which medium do waves travel the fastest? Slowest? How are electromagnetic waves different from mechanical waves? Mrs. Brown takes your cell phone away and puts it in a glass container with no air. What will happen when it rings?use sound waves, light waves, medium, mechanical waves in your answer. Which wave of the E-M spectrum has the shortest wavelength, which wave of the EM spectrum has the lowest energy?

What types of matter does light interact with? Light waves can be transmitted, absorbed or reflected. Materials the light interacts with can be classified as Transparent Opaque Translucent

What are transparent objects Allow almost all light to pass through and forms a clear image.

What are opaque objects Does not allow light to pass through

What are translucent objects Allows the light to pass though but forms a blurry image

What is the electromagnetic spectrum? http://www.youtube.com/watch?v=cfXzwh3KadE – intro to em spect.

What is the nature of light? Light energy travels as waves, but they do not travel through a medium Electromagnetic waves - Electrically charged particles vibrate and disturb the magnetic field around it Radiation –is the transfer of the energy as EM waves EM waves travel more slowly in a medium than in a vacuum

Why do you think we see the lightning before we hear the thunder? Light waves travel faster than the mechanical sound waves

What determines what light we see? Light comes in many different wavelengths. Visible light – the light we can see. White light contains all of the colors ROYGBV – the colors of the rainbow Red = the longest wavelengths and Violet = the shortest http://www.youtube.com/watch?v=Gf33ueRXMzQ

What are the other parts of the EM spectrum? EM waves are measured by freq. or wavelenght The light we see is only a small part of the EM spectrum The 2 parts close to visible light are Infrared (slightly longer wavelengths than red light) Ultraviolet (slightly shorter wavelengths than violet light) http://www.youtube.com/watch?v=P_PVz8HrrCI

Waves in the EM spectrum

Where does EM radiation come from? The sun gives off huge amounts of EM radiation in all parts of the spectrum The Earth shields us from some of the EM radiation – not all wavelengths can get through

How much energy does EM radiation have Higher frequency = smaller wavelength = more energy More energy = more dangerous Radio waves = lowest – least dangerous Gamma = highest frequency – most dangerous

exit Which color has the longest wavelength? Higher frequency = more/less energy. Which waves of the EM spectrum have the longest wavelengths? Which waves of the EM spectrum have the shortest wavelengths?

bellwork What section of the e-m spectrum are we looking at when we see the rainbow? Name the colors of the rainbow from longest wavelength to shortest. Which types of radiation are immediately to the left and to the right of the colors of the rainbow Which types of e-m radiation have the shortest wavelengths Which types of e-m radiation have the least energy

Fri Bellwork: IFC: Lucas wants to know if changing the type of medium will change the speed of a wave. He sends a beam of light through glass, and then through water. Then he records his observations and the angle of the beam. What is the dependent variable What is the independent variable What is his empirical evidence The glass creates a rainbow on the table next to the experiment. List the colors from longest wavelength to shortest. What is the colored portion of the E-M spectrum called? Which types of EM radiation are directly to the left and directly to the right of this colored portion of the E-M spectrum Which type of radiation has the longest wavelength?, Highest frequency?

What happens when a sound wave strikes a wall? What causes the colors of the rainbow

Light Wave Behaviors:

Behavior of Light http://studyjams.scholastic.com/studyjams/jams/science/energy-light-sound/light-absorb-reflect-refract.htm

When your alarm went off this morning, You used the remote to turn on the TV and check the weather station’s Doppler radar. It was going to be sunny, so you used your GPS to help you find the beach. You floated in the ocean and stretched out in the warm sun. Your friend brought a radio so you could listen to music. When you arrived home, you heated some pizza in the microwave. As you waited for it to cook, you turned on the TV, and heard the ringtone indicating you had received a new text message. List examples of the waves in the story AND classify as mechanical or electromagnetic