Unit 1-Lesson 3 MS-PS4-1 MS-PS4-2 Light Waves Unit 1-Lesson 3 MS-PS4-1 MS-PS4-2

Session 1 Objective(s): I can describe how the properties of waves apply to light. I can describe how the properties of light waves contribute to a beautiful sunrise or sunset.

What questions can you think about when you see this picture?

Nature of Light Link: https://www.youtube.com/watch?v=9 Vsl0Iom3S0 Video: The Science of Light and Color for Kids: Rainbows and the Electromagnetic Spectrum - FreeSchool Link: https://www.youtube.com/watch?v=9 Vsl0Iom3S0 Open your files to answer the follow-up questions.

Task # 1- Nature of Light BLUE GROUP-DOK 1 GREEN GROUP-DOK 2 VIOLET GROUP-DOK 2 What is the nature of light? Does light waves need a medium to travel? Compare and contrast the nature of light to the nature of sound. Light is said to be both a particle and a wave. Support this statement using evidence from the video. List the properties of light waves. What properties of light waves can you find in sound waves? Explain how white light is decomposed into seven different waves and relate their explanation to the prism activity.

Session 2-Objective(s): I can create a graphic representation of an electromagnetic spectrum.

The Electromagnetic Spectrum-Model In order to answer the Essential Question, “What are the characteristic properties of waves and how can they be used?”, you must be able to connect to the following: Every wave has a specific wavelength and frequency. Because light can travel through space, it cannot be a matter wave (mechanical) like sound or water waves. There is an inverse relationship between frequency and wavelength. Waves are used in the world to meet our societal needs and wants.

The Electromagnetic Spectrum-Model Your task is to create a graphic representation of the EM Spectrum that demonstrates these ideas. This should be a “graphic” representation which means it should be more words than pictures. All of the 4 core ideas above should be shown in your graphic representation. Explore these resources to aid you in your task: http://science.hq.nasa.gov/kids/imagers/ems/micro.html http://www.ducksters.com/science/physics/types_of_electromagne tic_waves.php Text book page 43.

Session 3- Objective(s) I can use mathematics to analyze the relationship between frequency and wavelength. I can explore ways in which the behavior, wavelength, frequency, and amplitude affect how waves are perceived by the human eye.

Warm-Up: Use your EMS model to answer the following questions: What makes visible light different from other waves in the electromagnetic spectrum? Why is visible light arranged into colors in the following order: red, orange, yellow, green, blue, indigo, and violet?

Light Waves and Colors: Video: What is Color? Ted-Ex Link: https://www.youtube.com/watch?v=UZ5UGnU7oOI

Task # 2: Light Waves and their Perception

Task # 2: Light Waves and their Perception BLUE Group-DOK 2 GREEN Group-DOK 3 VIOLET Group-DOK 3 Use the terms “absorption” and “reflection” describe how we see the different colors in the picture: kitten’s black and white fur, green grass, and yellow dandelion. Use a wave model of light to explain how the white light of the sun is separated to show different colors. Discuss the different wavelength or frequency of light in your explanation. Use a wave model of light to explain how the white light of the sun is separated to show different colors. Discuss the different wavelength or frequency of light in your explanation. Research: In case this picture was taken at night, how would the decrease in available light affect our perception of the items in the picture: kitten’s black and white fur, green grass, and yellow dandelion?

Wrap-Up The color with the shortest wavelength is _____________. It has the ________________ frequencies. The various wavelengths of light can be ________________ to produce white light.

Session 4-Objective(s) I can examine the measurable properties of different types of EM waves

Investigating Light as Transverse Waves What is the speed of light in vacuum? Relate the speed of light to the density of the media in which they travel. What can you conclude?

Frequency and Energy The more energy EM waves have, the more dangerous can they be to living tissue. Discuss the following point included in your with their groups in order to support the main idea. Open your files and record your answers and findings in your notebooks.

TASK # 3 BLUE Group-DOK 2 GREEN Group-DOK 3 VIOLET Group-DOK 3 Recall: What is the relationship between frequency and wavelength in light waves? Determine how is the energy of the wave related to its frequency (and wavelength). Determine how is the energy of the wave related to its frequency (and wavelength). Compare X-rays and Radio waves in terms of frequencies and wavelength and energy. Conclude which is safer for the living tissue. Determine how is the energy of the wave related to its frequency (and wavelength). Compare X-rays and Radio waves in terms of frequencies and wavelength and energy. Conclude which is safer for the living tissue. Provide a similar real-life example comparing two different types of EM waves in the same manner.

Think About It!! If radio waves are not compressional waves, like sound waves, explain what their role is in enabling us to hear music on our favorite radio station?

Session 5-Objective(s) I can examine the measurable properties of different types of EM waves. I can investigate the relationship between the brightness of light and the amplitude of the light wave.

Energy and Brightness

Task # 4 BLUE Group-DOK 2 GREEN Group-DOK 3 VIOLET Group-DOK 3 Draw: The graph shows how the brightness of car headlights changes as light moves farther from the source. On this graph, sketch curves to show the brightness of candlelight and floodlights. Discuss: Relate the brightness of the light to the energy of the light waves.   Draw: The graph shows how the brightness of car headlights changes as light moves farther from the source. On this graph, sketch curves to show the brightness of candlelight and floodlights. Discuss: Analyze the photos and the graphs. Develop an explanation for why the relationship between brightness and distance is not linear. Relate the brightness of the light to the energy of the light waves. Draw: The graph shows how the brightness of car headlights changes as light moves farther from the source. On this graph, sketch curves to show the brightness of candlelight and floodlights. Conclude: How is the amplitude and energy of a light wave related to its frequency and wavelength?

Solve the provided worksheet as groups. Thank You!!