A wave is a change (a variation) that travels through a substance (or medium). You can often see the change, such as the increased height of a traveling ocean, but what is important to understand is that the medium itself does not travel with the wave.

Near infrared lasers are very dangerous because you don't react with blinking as with a visible light laser (same goes for near-UV). Mid-IR ...

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Engineers use electromagnetic waves in all sorts of different inventions. We cannot see most electromagnetic waves, but you do observe these waves every day when you see visible light. Today we are going to build a fascinating invention so that we can see the different colors that are a part of visible light. Following the lesson, students can use the associated activity Building a Fancy Spectrograph to build their own device from simple materials to observe the spectra of different light sources! Then students can follow-up with the associated activity The Visual Spectrum to compare their findings between different light sources. Let's get started!

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We know that waves with high frequencies have a lot of energy. And, the waves that have smaller frequencies have less energy — think of these wave types as energetic waves that move very fast and lazy waves that move slow. Did you know that we cannot see most electromagnetic waves? The small section of the spectrum with the waves that we can see is called the visible spectrum, and the wavelengths that we can see allow us to see the colors of red, orange, yellow, green, blue, indigo, violet — the colors of the rainbow! We do not usually think of visible light (the visible spectrum) as being an electromagnetic wave, but it is. Figure 2 shows where visible light falls on the electromagnetic spectrum.

Ring lighting isn't diffused, so they can cast high-contrast shadows on your subject, or create hard-to-remove hotspots (aka spots of glare) on dark or colorful ...

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Waves move in two ways: longitudinally and transversely. Transverse waves oscillate (move back and forth) in a direction perpendicular to their motion. Our pond ripples, for instance, oscillate up and down but move horizontally towards the edge of the pond. Because the ripples oscillate perpendicular to their horizontal motion towards the edge, they can be classified as transverse waves.

4-PS3-2. Make observations to provide evidence that energy can be transferred from place to place by sound, light, heat, and electric currents. (Grade 4)

An electromagnetic wave is a transverse wave that can travel through empty space or a vacuum. Literally, electromagnetic waves are able to travel through "emptiness," unlike sound waves, which need "something" to travel through (for example, water or air). Electromagnetic waves have two parts to them: electric and magnetic. Both of these parts are considered transverse waves.

Let's think about our brave adventurers for a minute – who remembers what Angie and Harmon need to do next to find the treasure? That's right – they want to use lights underwater to find the sunken treasure ship. But first, they need to learn something about light waves so that they can choose the right kind of lights to use in their exploration.

What I Learned Today: At lesson end, give students time to think about what they learned. Invite a few students to volunteer something new that they learned through the lesson. (If students do not mention it, remind them that they learned that visible light is an electromagnetic wave and the only electromagnetic wave we can see; also it is only a small portion of the overall spectrum of electromagnetic waves.)

Ripples in a pond are good examples of waves. If no wind, a pond is smooth until a rock is thrown in and disturbs the water. Then ripples, "disturbances" in the pond, travel to the edges. The medium in this case is the water, through which the ripples travel. The water is not actually moving, but the waves (ripples) are.

Engineers use many types of electromagnetic waves. Gamma radiation is emitted by fuel rods in nuclear power plants, x-rays are used to see inside our bodies, ultraviolet light can be used to sanitize things, microwaves are used to cook, and radio waves allow us to communicate over large distances.

Figure 2. The electromagnetic spectrum in detail.copyrightCopyright © National Aeronautics and Space Administration, Science@NASA, Science Fun http://science.hq.nasa.gov/kids/imagers/ems/waves3.html

When we learned about sound, we discovered that sound travels in waves. Light can also be thought of as a wave – light is a form of an electromagnetic wave. That's a big word, so let's write it on the board.

Figure 3. The visual spectrum occurs between 400 nm (violet) and 700 nm (red).copyrightCopyright © National Aeronautics and Space Administration, Atmospheric Sciences Data Center http://eosweb.larc.nasa.gov/EDDOCS/images/Erb/wavelength_figure.jpg

Beginner lighting kits are aimed at those who are new to photography lighting, and this article is going to look at the top 4 budget-friendly photography ...

Sample, Sharon. National Aeronautics and Space Administration, Science@NASA, Science Fun, November 22, 2004. Accessed June 7, 2007. http://science.hq.nasa.gov/kids/imagers/ems/waves3.html

Each TeachEngineering lesson or activity is correlated to one or more K-12 science, technology, engineering or math (STEM) educational standards.

An electromagnetic wave is a type of wave that can travel through empty space... Yes, you heard correctly, empty space. Unlike sound waves, which need "something" to travel through (for example, water or air), electromagnetic waves are able to travel through "emptiness" or a vacuum.

Bring in small prisms for students to experiment with and explore how they break light into different wavelengths/colors.

Discussion Question: Turn on a radio, and tune it to a station. Next turn on a lamp. Ask the students what the two devices (radio and lamp) have in common. (Answer: They both use electromagnetic waves.) Tell students that today we are going to learn about a few different types of electromagnetic waves.

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The contents of these digital library curricula were developed by the Integrated Teaching and Learning Program under National Science Foundation GK-12 grant no. 0338326. However, these contents do not necessarily represent the policies of the National Science Foundation, and you should not assume endorsement by the federal government.

All 100,000+ K-12 STEM standards covered in TeachEngineering are collected, maintained and packaged by the Achievement Standards Network (ASN), a project of D2L (www.achievementstandards.org).

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Take high resolution line scan imaging to the next level by powering it with ultra-high-speed processing. Choose between the 10GigE PACE, 25GigE ACCEL, or 100GigE PINNACLE line scan cameras for uncompromised line-scan imaging possibilities for all your high-speed inspection needs.

The electromagnetic spectrum can be considered from another perspective — in nanometers — specifically from 400 nm to 700 nm. Each color in this visual range has a different wavelength. Red has the longest wavelength (700 nm) and violet has the shortest wavelength (400 nm). Green occurs near the middle at about 550 nm. A prism divides light into the wavelengths that make it up. Seen together, color waves make white light. White light is especially dramatic because many different colors of the visual spectrum can combine to make white light. Two "white" light sources can have very different spectral compositions. When white light shines on a prism, the colors in white light separate from each other because they refract at different angles depending on their wavelength (see Figure 4). Water droplets in the air refract sunlight to create rainbows.

Light diffusers are a complete line of film lenses which are able to optically alter the output beam shape of any light source in varying degrees of ...

Units serve as guides to a particular content or subject area. Nested under units are lessons (in purple) and hands-on activities (in blue).

Dunbar, Brian. National Aeronautics and Space Administration, Langley Research Center, Multimedia, April 13, 2007. Accessed June 1, 2007. http://www.nasa.gov/centers/langley/images/content/114284main_EM_Spectrum500.jpg

Waves with high frequencies have a lot of energy, and, waves with smaller frequencies have less energy. Most electromagnetic waves are not visible. However, a small section of the spectrum includes waves that we can see — it is called the visible spectrum (see Figure 3). These visible wavelengths allow us to see the colors of the rainbow: red, orange, yellow, green, blue, indigo and violet. We do not usually think of visible light (the visible spectrum) as being an electromagnetic wave, but it is.

Fiber Optic Cable (3). Fiber optic lighting uses optical fiber as a "light pipe," transmitting light from a source through the fiber to a remote location.

Light reflects at a predictable angle: the angle of the light that strikes a surface equals the angle of the light that bounces off the surface. Rough surfaces scatter — or diffuse — light, which can cause glare, blur an image or prevent us from seeing an image.

Figure 4. White light shining through a prism breaks apart into the colors of the visible light spectrum.copyrightCopyright © National Aeronautics and Space Administration, Science@NASA http://science.hq.nasa.gov/kids/imagers/ems/visible.html

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*Note: These concepts might be very difficult to visualize; if possible, create transparencies of the lesson figures for students to look at during class discussions.

Fill in the Table: On the left side of the classroom board, list the types of electromagnetic waves. Then work with the students to fill in the right side with ways that engineers use each type of wave. Examples of waves and their uses are:

Light can be absorbed, reflected (or diffused) and refracted. Some materials can affect how light bends in more than one way, refracting and reflecting at the same time. Objects made of more than one substance usually have different reflective, refractive and absorptive properties.

Let's look at another picture (show Electromagnetic Transparency #2) to see if we can figure out which waves have the most energy. Which waves do you think are the most powerful? That's right! gamma waves have very high frequencies and, consequently, have a lot of energy. This extreme amount of energy is one reason why gamma waves are very dangerous if improperly used.

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Filtering is the process of removing or separating the unwanted part of a mixture. In signal processing, filtering is specifically used to remove or extract part of a signal, and this can be accomplished using an analog circuit or a digital device (such as a computer). In this lesson, students learn...

This picture (show Electromagnetic Transparency #1– in the Attachments section) shows different kinds of electromagnetic waves. Engineers use electromagnetic waves for many different purposes. Gamma rays (nuclear power plant radiation), x-rays, light, microwaves, and radio waves (including cell phone waves) are all electromagnetic waves. What makes all these waves different from each other are their wavelengths and frequencies.

Students learn about the science and math that explain light behavior, which engineers have exploited to create sunglasses. They examine tinted and polarized lenses, learn about light polarization, transmission, reflection, intensity, attenuation, and how different mediums reduce the intensities of ...

These lights feature a batwing design that illuminates a larger area than built-in lighting systems and produces a greater light output making them ideal to use ...

Who would like to remind the class what frequency is? That's right! The frequency of a wave is the number of times a crest occurs each second. Some waves have really big — or even really small — frequencies. If a wave has a higher frequency (many waves in a certain amount of time), it has more energy. And, if a wave has a smaller frequency (fewer waves in a certain amount of time), it has less energy.

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In the ASN, standards are hierarchically structured: first by source; e.g., by state; within source by type; e.g., science or mathematics; within type by subtype, then by grade, etc.

Students are introduced to the correct technical vocabulary for lighting, which is different than layperson's terms. They learn about lamp (light bulb) technology and how to identify the various types of lighting in their spaces. They are also introduced to lighting controls as a means for saving en...

Light changes speed and direction — refracts — when it moves from one transparent medium to another. The refractive property of transparent materials can be used to make lenses that focus light (for example, cameras, eyeglasses, telescopes).

Since visible light is the part of the electromagnetic spectrum that our eyes can see (remember, we cannot see most electromagnetic waves), our whole world is oriented around it and the colors that are produced through this visible spectrum. Understanding these visible electromagnetic waves has enabled engineers to develop many instruments that can see farther and more clearly than our eyes. That is why we use satellites to look at the Earth, and telescopes to look at the Sky!

Figure 1. The electromagnetic spectrum.copyrightCopyright © National Aeronautics and Space Administration, Langley Research Center http://www.nasa.gov/centers/langley/images/content/114284main_EM_Spectrum500.jpg

Have students create an electromagnetic wave journal of different electromagnetic waves they experience throughout the week (for example, microwaving food, seeing a rainbow, listening to the radio, etc.).

You all did a great job today of being good listeners and thinking hard about light! We learned that light can be thought of as a wave, just as sound is a wave. We also learned that our eyes can only see some wavelengths of electromagnetic radiation. What do we call the set of wavelengths that our eyes can see ? That's right---the visible spectrum. We also discovered that engineers use many different electromagnetic waves for many different applications. In our next lesson, we are going to learn about rainbows, and continue to follow the adventures of Angie and Harmon. What do you think will happen to them next?

Students learn the basics of the electromagnetic spectrum and how various types of electromagnetic waves are related in terms of wavelength and energy. In addition, they are introduced to the various types of waves that make up the electromagnetic spectrum including, radio waves, ultraviolet waves, ...

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electromagnetic wave: A transverse wave with electric and magnetic parts that travels at 300,000 km/sec. Examples are gamma waves, x-rays, light waves, microwaves, and radio waves.

Ferebee, Michelle T. National Aeronautics and Space Administration, Atmospheric Sciences Data Center, April 10, 2006. Accessed April 17, 2012. http://science-edu.larc.nasa.gov/EDDOCS/images/Erb/wavelength_figure.jpg

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Have any of you ever had an x-ray? X-rays are not as strong as gamma rays, but they are still very powerful. A sunburn? Have any of you ever burned your skin when out in the hot sun (or overcast as well) too long? Sunburns come from ultraviolet light, which we cannot see, but can still burn our skin. Radio waves and microwaves have a smaller frequency, so they are much less powerful than x-rays or ultraviolet light. Waves are fascinating, that's for sure!

4-PS4-1. Develop a model of waves to describe patterns in terms of amplitude and wavelength and that waves can cause objects to move. (Grade 4)