The factor that determines which type of electromagnetic energy is present is the wavelength of the light, or the distance between each wave.
Using the diagrams below, drag each of the types of electromagnetic energy pictured in order from largest wavelength more spread out to shortest wavelength more smooshed together. The wavelength of a certain type of energy determines not only which kind of energy it is but also what it can do and how it can be used.
As humans, our eyes are only able to see a small portion of the electromagnetic spectrum, which we call the visible light spectrum. Notice that this image is the mirror image of the previous graphics. Here we have the longer radio waves on the right side of the spectrum. This doesn't change the meaning of what you're seeing in any way, but you do need to be mindful of how the particular graphic you're looking at is set up in order to read it correctly.
You've already ranked the types of electromagnetic energy by wavelength; now do the same thing with the colors of visible light in the diagram below. Watch Light: Crash Course Astronomy 24 to learn more about the different forms of light and how we experience color:. Now that you know what color is, you will need to understand how we see color.
Light can be reflected or absorbed by objects. Depending on the object, different wavelengths aka colors of light are reflected from the object to your eye. The other colors are absorbed. The plant is illuminated by sunlight. Sunlight appears to be a sort of yellowish-white, but it actually contains all colors. When the sunlight reaches the plant, all of the colors are absorbed except for the electromagnetic energy that our eyes perceive as green, which bounces off the plant and travels to our eyes.
Back to our blue sky. Students explore why the sky is blue. In this light instructional activity, students conduct an experiment using water, flashlights, and milk to test why the sky is blue. Students view a PowerPoint, take notes on their results and draw For Teachers 6th - 12th. Students explore diffusion or scattering of light.
Don't keep your physics class in the dark about night—introduce them to the concept with a short animated video! The narrator discusses how the Big Bang set our universe into an ever-expanding motion where the stars we observe now appear For Students 9th - 12th Standards. Air is clear, so why do we see the sky as blue? The video explains the way light waves travel through the air and the result of our perceptions.
It uses simple diagrams and illustrations to reinforce the variety of colors present versus For Teachers 6th - 8th. Students participate in a discussion of the sky and colors.
They watch a demonstration of how colors can change. They examine the issue of if weather should be a part of their coursework. Students investigate why the sky is blue and the sunset is red. They are asked why do you think that we see the sky as blue? Students write a hypothesis on their "Blue Sky Lab Sheet". They explain why they think that the sky is blue For Teachers 5th - 9th. Use a container full of water as a prism and show that as light is bent, the individual colors from different wavelengths become visible.
This explains why the sky appears to be blue midday, and why as the sun nears the horizon, it looks For Teachers K. Students create prisms in order to separate white light from the sun into the visible light spectrum. They become meteorologists and observe the sky for one week, recording all of their observations.
For Students 9th - Higher Ed. The answer is: a method to celebrate a major milestone. A proud video celebrates , followers and gives an idea of how big that number is. The resource in the Veritasium playlist goes on to answer several questions posed by Finally, an electromagnetic spectrum lab that will get glowing reviews from your class!
Keller, Lori. Then dip the spoon in a glass of skim milk, coating the spoon, and slowly add and stir March 20, Stir until you can clearly see the beam shining through the liquid.
Look at the beam from the side of the glass and then from the end of the glass. You can also let the light project onto a white card, which you hold at the end of the glass. From the side, the beam looks bluish-white. From the end, it looks yellow- orange.
If you have added enough milk to the water you will be able to see the color of the beam change from blue-white to yellow-orange along the length of the beam. Explain to students that we add milk for the light to reflect off of. Student Evaluation Distribute the same image and word definitions worksheet from the beginning of the lesson, and see if the students can match the image with the description by themselves.
Track their progress. Draw the electromagnetic spectrum on board along with all key terms, wavelength, scattering, the earth, clouds, wavelength frequencies. Continue with lesson as follows. Teacher Self-Evaluation Assess how well the students are learning by asking them questions pertaining to why the sky is blue at the end of the lesson. Ask them what they found challenging about the lesson and make changes accordingly for the following year.
If students seem confused or stuck during the activities of worksheet explain the part they are confused about in similar terms they can understand then draw images on the board accordingly. Additional Notes: This lesson may be challenging with the introduction to new vocabulary and concepts. Therefore, after each PowerPoint slide pause and reiterate what was employed, and ask if anyone has any questions or are confused.
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