Chapter 27: Light and Electromagnetic Waves
Pace:  8 class periods
Checkpoint: 17 March
Essential Questions:
  • Describe how does Light interact with matter by reflection, absorption, and transmission.
  • Illustrate how are Electromagnetic waves (e.g., radio, microwave, infrared, visible light, ultraviolet, x-ray) produced?
  • How does changing the motion (acceleration) of charges or by changing magnetic fields affect Electromagnetic waves?
  • Why can electromagnetic waves travel through matter, but they do not require a material medium. (That is, they also travel through empty space.) 
  • Distinguish Electromagnetic radiation by their wavelength and energy.
Standards Covered:
  • P4.6A Identify the different regions on the electromagnetic spectrum and compare them in terms of wavelength, frequency, and energy.
  • P4.6B Explain why radio waves can travel through space, but sound waves cannot.
  • P4.6C Explain why there is a delay between the time we send a radio message to astronauts on the moon and when they receive it.
  • P4.6D Explain why we see a distant event before we hear it (e.g., lightning before thunder, exploding fireworks before the boom).
  • P4.9A Identify the principle involved when you see a transparent object (e.g., straw, piece of glass) in a clear liquid.
  • P4.9B Explain how various materials reflect, absorb, or transmit light in different ways. 

Kahoot and Differentiation

Pre and Post test data will be collected and used by the teacher to offer alternative projects to demonstrate mastery. You may also self select for an alternative assignment upon conferencing with your teacher.  Please talk to your teacher if you have any questions.  

Student Examples:

Chapter 27 PDF textbook and notes

cpte27.pdf
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ch27.ppt
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27.1 Early Concepts of Light
27.2 The Speed of Light 
6-9 March

BOOK NOTES (10-15 min)
1. Review Chapter 27 sections 1-2 and complete Cornell Notes notes for this section including the "terms to know". Include diagrams and examples when possible. 

VIDEO NOTES (10-15 min)
2. Add to your Cornell Notes using Electromagnetic Wave (EMW) introduction video. Add details and diagrams to your notes.

PRACTICE (15-20 min)
3. Complete the 14-1 Reflection and Refraction; The Speed of Light Practice, below on your own or with your table partner and check in for credit.  (#3 is optional)
cpps1401.pdf
File Size: 138 kb
File Type: pdf
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Standard Practiced:
prior knowledge

Big Ideas:
-Light has a dual nature, part particle and part wave.
-The speed of light has been calculated to about 300,000 km/s.

Terms/Names to know:
Photons
Olaus Roemer
Christian Huygens
Albert Michelson
Speed of light
Light-year

27.3: Electromagnetic Waves
10 March

BOOK NOTES 
10-15 min
1. Review Chapter 27 sections 3 and complete Cornell Notes notes for this section including the "terms to know".  Include diagrams and examples when possible. 

VIDEO NOTES 
10-15 min
2. Add to your Cornell Notes using Electromagnetic Waves: Definition, Sources & Properties, from Education Portal (expires 2 April). Add details and diagrams to your notes. 

ELECTROMAGNETIC SPECTRUM ONLINE MODULE PRACTICE WS
15-30 min
3. Using the online learning module and tools from the National Science Foundation, explore the *Electromagnetic Spectrum learning module. This module should take some time to explore and complete the practice. Complete the practice sheet and check in when completed. Exploration 3 is extra credit.  
emsmodule.practice.pdf
File Size: 105 kb
File Type: pdf
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MASTERY CHECK 
5-10 min
4. Electromagnetic waves originate from the vibrations of pure energy and can travel in a vacuum or thru matter. Mechanical Waves originate from the vibrations matter and can only travel thru matter. Explain why radio waves can travel through space, but sound waves cannot.
Standard(s) Practiced:
P4.6A
P4.6B 

Big Idea:
The electromagnetic spectrum consists of radio waves, microwaves, infrared, light, ultraviolet rays, X-rays, and gamma rays and originate from the vibrations of pure energy.

Terms to Know
Electromagnetic wave
Electromagnetic Spectrum
Infrared
Ultraviolet

27.4: Light and Transparent Materials
27.5: Opaque Materials
11-12 March

BOOK NOTES 
10-15 min
1. Review Chapter 27 sections 4 and 5 and complete Cornell Notes notes for this section including the "terms to know". Include diagrams and examples when possible. 

VIDEO NOTES 
10-15 min
2. Add to your Cornell Notes using Transparent and Opaque Materials in Electromagnetic Waves, from Education Portal (expires 2 April). Add details and diagrams to your notes. 

PRACTICE
5-10 min
Review the Opaque, Translucent and Transparent Introduction video. Create your own example of each in your lab notebook, screencast or voice thread.

REVIEW GAME
5-10 min
Play the Transparent, Opaque, and Translucent Game. The game is basic but a good review of the big ideas for this section.

MASTERY CHECK
5-10 min
How do the transparency and opacity of objects depends on how light waves interact with the materials of those objects. Provide an example for one transparent object and one opaque object.
Standard(s) Practiced:
P4.9A
P4.9B
Big Idea: 
-Light passes through materials whose atoms absorb the energy and immediately reemit it as light.
-In opaque materials, any coordinated vibrations given by light to the atoms and molecules are turned into random kinetic energy.
Terms to Know:
Transparent
Opaque
Reflection
Absorption
Remission

27.Time Delays and Sound Waves
13 March

1. Time Delay Article Response
15-20 min
Read the "Time Delay between Mars and Earth" article from the European Space Agency and write a response that explains what NASA and astronauts on the moon would have a similar problem.  Be sure to include:
  • the problem
  • the reason for the problem
  • solutions for the problem
Check out this article if you want to learn more about radio waves and the speed of light.

2. Distant Events Discussion
15-20 min 
Why do you see a distant event before hearing it (e.g., lightning before thunder, exploding fireworks before the boom)?  Include example and reasoning with an illustration that supports your ideas. 
  • hint- be sure to discuss the electromagnetic wave (light) and the mechanical wave (sound) and how they travel at different speeds because they are different types of waves.
Standard(s) Practiced:
P4.6C
P4.6D
Big Idea:
Radio waves travel at the speed of light, 300,000 km/sec.  
Terms to Know:
Radio Wave

27.Lab
16 March

1. Molecules and LIght PHET Lab
45 min
5 pts
Using the PHET interactive simulation for molecules and light embedded in this section. 

Complete on your own or with a lab partner today in class. It may be completed on your own time if needed.  

Part five of this lab might require outside of the lab research depending on the question you choose to answer.  More information might be found in these interactive labs:
Microwaves
Greenhouse Effect
molecules.light.phetlab.docx
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If the lab above does not open try opening this file below.

molecules-and-light_en-1.jar
File Size: 1232 kb
File Type: jar
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Standard(s) Practiced:
P4.9B

Big Idea:
Identify that absorption of light depends on the molecule and the type of light

Terms to know:
Molecules
Light
Photons
Absorption

27.Review

Ignore any review about Polarization and Shadows

27 Optional Extra Credit

Complete the practice on blue "ASSESS" pages 548-549 #1-17, and 24-32
Complete either of the following practice pages before the Unit Mastery Check for 2 points EXTRA CREDIT on your Post Test. 
27.1_27.5.review.pdf
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skip #3, 12, 13, and 14 on the practice assessment of you choose to complete
27.PracticeAssessment.pdf
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Ch27 Post Test in class by 17 March
Remediation, Late Work and Extra Credit due within 10 
days of test date.