# Purpose: To explore the Electromagnetic Spectrum using a variety of interactive Internet resources and hands-on activities. An electromagnetic spectrum.

## Presentation on theme: "Purpose: To explore the Electromagnetic Spectrum using a variety of interactive Internet resources and hands-on activities. An electromagnetic spectrum."— Presentation transcript:

Purpose: To explore the Electromagnetic Spectrum using a variety of interactive Internet resources and hands-on activities. An electromagnetic spectrum is an arrangement of electromagnetic waves according to wavelength and frequency. The electromagnetic spectrum includes radio waves, infrared waves, visible light, ultraviolet light, X-rays, and gamma rays. Identify and compare the wavelengths of the electromagnetic spectrum using fun, interactive web resources.

Tour the EM Spectrum Go to and read the following page: http://imagers.gsfc.nasa.gov/ems/waves3.html http://imagers.gsfc.nasa.gov/ems/waves3.html Then, navigate to bottom of page to take a tour of the EM Spectrum Once you have done this, please complete the attached sheet for Activity 2

The Electromagnetic Spectrum Objectives: 1. List component parts of the electromagnetic spectrum. 2. What is the relationship between wavelength and frequency?

Go to http://lectureonline.cl.msu.edu/%7Emmp/applist/Spectrum/s.htm http://lectureonline.cl.msu.edu/%7Emmp/applist/Spectrum/s.htm In this applet, you can click on the wavelength/frequency scale and change the wavelength and frequency by dragging the mouse around. You can also change the wavelength by using the arrow keys on your keyboard. Holding the shift key down while pressing the left or right arrow keys changes the wavelength by a factor of 10. You can click on the wavelength/frequency scale and change the wavelength and frequency by dragging the mouse around. Note the appearance of a blue vertical line or position bar to indicate your position along the electromagnetic spectrum. The values of frequency, wavelength, and energy (with selected units) correspond to the location of the "white position bar". Once you have done activities 2 and 3, complete worksheet. Note: You may have to go back to the website in Activity 2 to complete this sheet or go back to previous slides

Objective: Students will discover and verify the relationship between Wavelength and Frequency of the Electromagnetic Spectrum. Go to: http://imagine.gsfc.nasa.gov/docs/teachers/l essons/roygbiv/roygbiv.html http://imagine.gsfc.nasa.gov/docs/teachers/l essons/roygbiv/roygbiv.html Read through this activity and print out all pages. We will do this activity next class.

Lets Review So Far Watch the following movie and answer the questions in your handout.

Reflection, Refraction, and Diffraction Objectives: Explain how refraction is used to separate white light into the colors of the spectrum Describe how diffraction and interference patterns demonstrate the wave behavior of light State and give an example of the law of reflection Go to the following sites: http://csep10.phys.utk.edu/astr162/lect/light/ref-diff.html http://csep10.phys.utk.edu/astr162/lect/light/ref-diff.html http://science.howstuffworks.com/question41.htm When you are finished reading this page, click on next at the bottom. Watch the prism. Answer the questions for Activity 4 - See attached handout

Go to the following site and answer the questions. http://www.ngsir.netfirms.com /englishhtm/Diffraction.htm

Go to: http://www.glenbrook.k12.il.us/gbssci/p hys/Class/refln/u13l1c.html http://www.glenbrook.k12.il.us/gbssci/p hys/Class/refln/u13l1c.html When you are finished watching the observation, draw your own picture to demonstrate that you understand the law of reflection. Make sure to label all parts and include definitions.

Coronas & Diffraction A corona is a bright disk of light that appears around the Moon or the Sun. It forms when moonlight or sunlight passes through a thin cloud layer filled with water droplets. When the light passes by the edges of the droplets, it is diffracted or bent. This diffraction causes the "white" light to break up into its component colors. Blue light (shortest wavelength) is bent the most, forming the inner ring of the disk. Red light (longest wavelength) forms the outer ring. The disk may be fairly sharp and crisp, or it can be diffuse and hazy. Coronas around the Sun are more difficult to observe because of the Sun's brightness. Source: http://www.scienceclarified.com/As-Bi/Atmospheric- Optical-Effects.htmlhttp://www.scienceclarified.com/As-Bi/Atmospheric- Optical-Effects.html

Pictures of Coronas

Go to the following Website and answer the questions on your handout. http://ww2010.atmos.uiuc.edu/(Gl)/wwh lpr/coronas.rxml

Colors Watch the following movie and answer the questions in your handout.

Light and Technology Watch the following movie and answer the questions in your handout.

Light & Review Watch the following movie and answer the questions in your handout.

1.Slide 2 Pic from: http://cosmology.berkeley.edu/Education/ DEMOS/Desk_Top_Stars/E_M_spectrum.j pg http://cosmology.berkeley.edu/Education/ DEMOS/Desk_Top_Stars/E_M_spectrum.j pg 2. Slide 3 Pic from: http://www.safetycenter.navy.mil/acquisitio n/RFR/images/spectrum.jpg http://www.safetycenter.navy.mil/acquisitio n/RFR/images/spectrum.jpg 3.http://www.unitedstreaming.com/http://www.unitedstreaming.com/ Picture and Movie Sources

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