TI08

Enduring Understandings
Invisible forms of energy pervade our world. Some are produced by natural processes, and some are the result of technological processes. Some pose some threat to human health, but others seem to be entirely safe and incredibly useful. There is a common origin for the waves we use for radio broadcasts, remote controls, heat lamps, tanning salons, and x-rays. This section will study these relationships.

Prior Learning:
S8.C.2.1 Describe energy sources, transfer of energy, or conversion of energy.
 * S8.C.2.1.1 Distinguish among forms of energy (e.g., electrical, mechanical, chemical, light, sound, nuclear) and sources of energy (i.e., renewable and nonrenewable energy)
 * S8.C.2.1.2 Explain how energy is transferred from one place to another through convection, conduction, or radiation.
 * S8.C.2.1.3 Describe how one form of energy (e.g., electrical, mechanical, chemical, light, sound, nuclear) can be converted into a different form of energy.


 * Learning Objectives: Students will be able to...**
 * Compare or analyze waves in the electromagnetic spectrum (e.g., ultraviolet, infrared, visible light, X-rays, microwaves) as well as their properties, energy levels, and motion.
 * Apply knowledge of transmission and absorption of electromagnetic radiation.
 * Analyze energy transformations of a speaker and dynamic microphone.
 * Apply knowledge of encoding and decoding information in analog radio waves.
 * Apply knowledge of transmitting and receiving information in electromagnetic radiation.
 * Explain how electricity induces magnetism and how magnetism induces electricity as two aspects of a single electromagnetic force.

Working Draft of Essential Learning Activities/Strategies/Technologies

 * Investigating Sound Waves
 * Application of Wave Speed Equation
 * Make a Speaker Investigation [[file:Speaker.doc]]
 * Generating Radio Waves (real and online)
 * Researching EM Spectrum Properties

Supplemental Resources
> [|Sound waves] > [|Cool Wave Activities & Sites] > [|Wave Characteristics] > [|TV Remote Control Activity w/ Infrared Radiation]
 * Cassette Tape Investigation
 * Sunscreen investigation
 * X-Ray Simulations
 * Cell-Phone Health Debate
 * EM Induction Investigation (VCR, Hard Drive, etc)
 * Investigating Infrared Waves (remote controls )
 * [|The Soundry]

http://electronics.howstuffworks.com/radio-spectrum.htm http://www.howstuffworks.com/radio.htm http://electronics.howstuffworks.com/cell-phone-radiation.htm http://home.howstuffworks.com/microwave.htm http://health.howstuffworks.com/sunscreen.htm http://health.howstuffworks.com/x-ray.htm http://micro.magnet.fsu.edu/electromag/java/faraday2/ Ch 11.4 Electromagnetics; http://www.fcc.gov/cgb/consumers.html [| Electromagnetic simulation-PhET] Online EM Radiation Simulations LabPro Sound Analysis Devices
 * Text- Science Spectrum** CH 10.1 Wave Types (EM vs Mechanical); Ch 10.2 Wave Characteristics; Ch 12.1 & 12.2 Telecommunications

Instructional Objectives: Students will be able to ...
//Sound Waves// //Speakers & Microphones// //Electromagnetic Spectrum// //Wireless Devices// //Electromagnetic Induction//
 * Describe the process that creates sounds.
 * Describe the phenomenon of electromagnetism.
 * Draw diagrams of speakers and microphones, and label the parts.
 * Describe the generation of electromagnetic waves.
 * Calculate wavelength, frequency, or wave speed using the wave equation.
 * Identify transmitter, receiver and medium for communications systems.
 * Explain the difference between AM and FM radio waves.
 * //Cellular Networks//
 * Predict the effects of moving a magnet near a coil, or vice versa.
 * //Magnetic Tapes//
 * Describe a method for magnetizing a substance with an electromagnet.