96 Electromagnetic Spectrum

LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only by teachers currently teaching the SEPUP course to customize the unit to match their students’ learning levels or to insert additional teaching aides. Modified slides may be used only by the modifying teacher in his or her classroom, or shared with other teachers of SEPUP within the teacher’s school district, with these same restrictions. Modified slides may not be taken out of the classroom or distributed to any non-student person or organization. Except for use with students in the classroom, modified slides may not be published in printed or electronic form, including posting on the Internet. Only text may be modified: photographs and illustrations on the slides may not be modified in any way except to change their size. DISCLAIMER OF WARRANTY. THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (“University”) MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. University will not be liable for any costs, damages, fees or other liability, nor for any direct, indirect, special, incidental or consequential damages (including lost profits) with respect to any claims by the purchaser or user of SEPUP or any third party on account of or arising from the use or modifications to the slides. Client acknowledges and accepts that University services are provided on an as-is basis. Copyright © 2015 The Regents of the University of California. All rights reserved. Header photo: Sam Howzit | Flickr Creative Commons Slide Design: Shaun Wegscheid | Fonts: Arial, Kalinga Title slide photo: Jean Scheijen | FreeImages.com

96 Electromagnetic Spectrum Key Vocabulary absorption electromagnetic spectrum electromagnetic wave infrared reflection transmission ultraviolet

96 Electromagnetic Spectrum Are there invisible forms of energy in sunlight? Record your answer in your notebook and share your evidence.

96 Electromagnetic Spectrum Complete the “Before” column of student sheet 96.1, “Anticipation Guide: The Electromagnetic Spectrum”

96 Electromagnetic Spectrum Read the introduction and look for key ideas Herschel’s Experiment

96 Electromagnetic Spectrum What are the characteristics of electromagnetic waves?

96 Electromagnetic Spectrum Complete the reading

96 Electromagnetic Spectrum Sir Frederick William Herschel What would the result of the experiment have been if Herschel had not used a control? Share your thoughts with the class.

96 Electromagnetic Spectrum The Electromagnetic Spectrum

96 Electromagnetic Spectrum Complete the “After” column of student sheet 96.1, “Anticipation Guide: The Electromagnetic Spectrum”

96 Electromagnetic Spectrum Analysis question 1 With what evidence did Herschel support his discovery of infrared waves?

96 Electromagnetic Spectrum Analysis question 2 With what evidence did Ritter support his discovery of ultraviolet waves?

96 Electromagnetic Spectrum Analysis question 3 Compare infrared and ultraviolet. In what ways are they similar? In what ways are they different?

96 Electromagnetic Spectrum Analysis question 4 From the following list, choose the one that describes the portion of the range of electromagnetic waves that is visible. a. More than ½ b. about ½ c. ¼ - ½ d. ₁ ⁄ ₁₀ – ¼ e. much less than ₁ ⁄ ₁₀ Explain your reasoning, citing evidence from this activity.

96 Electromagnetic Spectrum Analysis question 5 Is it likely that light frequencies higher than ultraviolet were the main cause of Tia Ana’s cataracts? Explain why or why not.

96 Electromagnetic Spectrum What are the characteristics of electromagnetic waves? X-rays are part of the electromagnetic spectrum.

96 Electromagnetic Spectrum Key vocabulary definitions Absorption - The process of taking in or taking up. Electromagnetic spectrum - The range of electromagnetic waves that vary from high- frequency gamma rays to low-frequency radio waves.

96 Electromagnetic Spectrum Key vocabulary definitions Electromagnetic wave - A transverse wave that involves disturbances in electric and magnetic fields that are perpendicular to each other. Electromagnetic waves can travel through media and through a vacuum. Infrared - Electromagnetic radiation that has a wavelength longer than visible light but shorter than microwaves.

96 Electromagnetic Spectrum Key vocabulary definitions Reflection - The light that is bounced off of an object or material. Transmission - The act of energy passing through a medium. Ultraviolet - Electromagnetic radiation that has a wavelength shorter than visible light but longer than X-rays.