![]() ![]() For example, at the beach, the incoming waves from the ocean and the outgoing waves from the surf drawing back from the beach interfere with one another. Interference is what happens when multiple waves interact. These properties are interference and the relationship between a wave's speed, its frequency, and its wavelength. In this project you will take advantage of some physical properties of waves in order to estimate the speed of light. (Illustration from Abrisa Glass & Coatings, 2005) X-rays, light, and microwaves are all examples of electromagnetic waves. Light (the part of the electromagnetic spectrum that we can detect with our eyes) is only a small portion of this range. Electromagnetic radiation covers a huge range of wavelengths. Wavelengths between 400 and 700 nanometer are visible as colors and make up a very small portion of the electromagnetic spectrum.įigure 1. The focus of this diagram is to display the portion of the spectrum that is visible to the human eye. The electromagnetic spectrum extends from very short wavelength gamma rays to very long wavelength radio waves. As you can see in Figure 1 below, the range of microwave wavelengths is from 0.01 cm to 10 cm. The absorbed microwave energy heats these molecules and cooks the food. Microwaves work well for cooking because their energy can be efficiently absorbed by molecules commonly found in food, including water, sugars, and fats. So waves with high frequency have short wavelengths, and waves with low frequency have long wavelengths.Įlectromagnetic waves interact with materials in different ways, depending on the nature of the material and the frequency of the electromagnetic wave. The wavelength of an electromagnetic wave is inversely proportional to its frequency. As the frequency decreases, so does the energy. ![]() Electromagnetic waves cover a huge range of frequencies, from high-frequency gamma rays and x-rays, to ultraviolet light, visible light, and infrared light, and on into microwaves and radio waves. They do not depend on an external medium-unlike a mechanical wave such as a sound wave which must travel through air, water, or some solid medium. Electromagnetic waves can travel through the vacuum of interstellar space. ![]() Try different sized marshmallows.Microwaves, like light, are an example of electromagnetic waves. Use different sized balloons or other elastic material to see if the distance the mini marshmallow goes increases or decreases. While doing so, it will carry the mini marshmallow with it and send it flying through the pool noodle. When you pull the balloon and let it go, the balloon will return to its original shape. The balloon is elastic and will stretch easily. Set up some targets and have fun playing with your Mini Marshmallow Launcher.Pull back the knot and launch the mini marshmallow.Put a mini marshmallow into the launcher.Once centered, use the tape to secure the balloon in place.Center the knot over the hole in the center of the pool noodle. Stretch the balloon over the piece of pool noodle.Tie a knot in the balloon as if you had just blown it up.Use the scissors to carefully cut an approximately 3 inch piece from one end of the pool noodle.Learn how to make a fun little mini marshmallow launcher with this super easy motion science experiment. ![]()
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