Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays.
The human eye can only detect only a small portion of this spectrum called visible light. A radio detects a different portion of the spectrum, and an x-ray machine uses yet another portion. NASA's scientific instruments use the full range of the electromagnetic spectrum to study the Earth, the solar system, and the universe beyond.
When you tune your radio, watch TV, send a text message, or pop popcorn in a microwave oven, you are using electromagnetic energy. You depend on this energy every hour of every day. Without it, the world you know could not exist.
Our Sun is a source of energy across the full spectrum, and its electromagnetic radiation bombards our atmosphere constantly. However, the Earth's atmosphere protects us from exposure to a range of higher energy waves that can be harmful to life. Gamma rays, x-rays, and some ultraviolet waves are "ionizing," meaning these waves have such a high energy that they can knock electrons out of atoms. Exposure to these high-energy waves can alter atoms and molecules and cause damage to cells in organic matter.
These changes to cells can sometimes be helpful, as when radiation is used to kill cancer cells, and other times not, as when we get sunburned. Electromagnetic radiation is reflected or absorbed mainly by several gases in the Earth's atmosphere, among the most important being water vapor, carbon dioxide, and ozone. Some radiation, such as visible light, largely passes is transmitted through the atmosphere.
These regions of the spectrum with wavelengths that can pass through the atmosphere are referred to as "atmospheric windows. While our atmosphere is essential to protecting life on Earth and keeping the planet habitable, it is not very helpful when it comes to studying sources of high-energy radiation in space.
Instruments have to be positioned above Earth's energy-absorbing atmosphere to "see" higher energy and even some lower energy light sources such as quasars.
Introduction to the Electromagnetic Spectrum. Retrieved [insert date - e. Science Mission Directorate. National Aeronautics and Space Administration. Tour of the Electromagnetic Spectrum. What is Electromagnetic energy? Electromagnetic Spectrum Series Series Homepage. Infrared Waves. Reflected Near-Infrared. Visible Light.Embed a running copy of this simulation.
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Embed an image that will launch the simulation when clicked. Make waves with a dripping faucet, audio speaker, or laser! Adjust frequency and amplitude, and observe the effects. Hear the sound produced by the speaker, and discover what determines the color of light.
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Worksheet on wave basics
PhET is supported by. Sample Learning Goals Make waves with water, sound, and light and see how they are related. Discuss wave properties using common vocabulary. Explain how changing the frequency and amplitude affects the characteristics of the wave. Design an experiment to measure the speed of the wave. Version 1. For Teachers. Teacher Tips Overview of sim controls, model simplifications, and insights into student thinking PDF. Related Simulations. Wave on a String Wave Interference Sound.
Software Requirements. Offline Access Help Center Contact. Source Code Licensing For Translators.The five categories included in the peer review process are. All types of waves transmit energy, including beach waves, sound, light, and more. When an earthquake occurs it generates four different types of seismic waves. We will focus on two of these: Compressional-P longitudinal and shearing-S transverse "body waves. Your Account. This page first made public: May 24, Also works well with smaller regular Slinkys.Is light a particle or a wave? - Colm Kelleher
It is best if the learners have some knowledge of earthquakes and earthquake waves. This activity goes well after the interactive demonstration Human Waves. This should probably come after a general introduction to plate tectonics but can be fairly early in learning about earthquakes.
It could also be done as part of a physical science unit as an applied example of wave types and characteristics. Compare and contrast the difference between P and S seismic waves based on the direction of particle motion relative to the direction of propagation.
Using and explaining physical models of natural processes. See attached file for educator notes, NGSS alignment, student exercise, and answer key. You will need to caution students to treat the Slinkies with care as they can tangle and get bent. It is great if you can invest in at least one "Super" Slinky for large group demonstrations.
These are 8" when compressed rather than the 2. Treat the Super Slinky with care, however, as they are particularly prone to tangling. Super Slinky needs to be stored on a rod or stand. The student exercise serves as the summative assessment for the activity.This lesson is the introductory lesson for the students and is a lesson that takes place over the course of 2 days.
Waves can be a challenging topic for a middle school student. With many waves being "invisible", it can be difficult for a student to relate to and explain. As a result, they have many misconceptions about wave behavior. In order to allow students to make connections, this lesson helps make wave properties visible.
The Next Generation Science Standards have identified an essential question that can drive student learning in " What are the characteristic properties of waves and how can they be used?
MS-PS Use mathematical representations that describes a simple model for waves that includes how the amplitude of a wave is related to the energy in the wave. The disciplinary core idea PS4-A explains that a simple wave has a repeating pattern with a specific frequency, wavelength, and amplitude. In turn, creating relationships between these wave properties is critical for student understanding.
Graphs and charts are a great method for representing patterns in data mathematically.
With the use of slinkies, students can discover these relationships and gather data for developing their own graphs showing property relationships. Read the EQ as a class and break down what the question might be asking. Many middle school students have an especially difficult time verbalizing what a property is.
Without this understanding, it will be challenging for them to connect to what they are supposed to be learning. A conversation may unfold something like this:. Your response does not have to be connected to science. In your everyday life when you hear that word, what does it mean to you?
One characteristic about me is that I love science. What does the word property mean to you?
Again, your response does not have to be connected to science. In your everyday life when you hear the word property, what does it mean to you? Now, I am wondering how a wave can own something. What is it that a wave can own? They are both words that make us think of descriptions of things. I wonder why both words are in this Essential Question. Wait time! Let the students think about why both words are needed.
Let me ask you this. I notice that in this question the word characteristic is used a little differently. It says, "characteristic properties". I wonder how the meaning of the word characteristic changes when it is put in front of another word like this. For example, what if I said, "What are the characteristic properties of a science teacher? That makes sense. So, what we are looking for here it seems is typical or common ways to describe waves.
Maybe it is the things that waves might have in common. It mentions, "how can they be used". What do you think we should look for when making connections to that?
Once the class has an understanding of the EQ, have students close their eyes and picture as many waves as they can in 20 seconds.High marks in science are the key to your success and future plans. Test yourself and learn more on Siyavula Practice. We have already studied transverse pulses and waves. In this chapter we look at another type of wave called a longitudinal wave.
In transverse waves, the motion of the particles in the medium was perpendicular to the direction of the wave. In longitudinal waves, the particles in the medium move parallel in the same direction as to the motion of the wave. Examples of transverse waves discussed in the previous chapter are water waves. An example of a longitudinal wave is a sound wave. A longitudinal wave is a wave where the particles in the medium move parallel to the direction of propagation of the wave. When we studied transverse waves we looked at two different motions: the motion of the particles of the medium and the motion of the wave itself.
We will do the same for longitudinal waves. A longitudinal wave is seen best in a slinky spring. Do the following investigation to find out more about longitudinal waves. Take a slinky spring and lay it on a table. Hold one end and pull the free end of the spring and flick it back and forth once in the direction of the spring.
Observe what happens. Tie a ribbon to the middle of the spring. Watch carefully what happens to the ribbon when the end of the spring is flicked. Describe the motion of the ribbon. From the investigation you will have noticed that the disturbance moves parallel to the direction in which the spring was pulled. The ribbon in the investigation represents one particle in the medium. The particles in the medium move in the same direction as the wave. As in the case of transverse waves the following properties can be defined for longitudinal waves: wavelength, amplitude, period, frequency and wave speed.
Test yourself now High marks in science are the key to your success and future plans. Sign up and test yourself. Video: VPdkf. Previous End of chapter exercises.
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Higher Education. Adult Education. Digital Resources for Students Google Apps. Internet Activities. English Language Arts. Foreign Language. Social Studies - History. History World History. For All Subject Areas. See All Resource Types. Waves Vocabulary Worksheet and Waves Lab.The offer, at 620p per share, is a 38. Embattled chief executive Gavin Patterson has told investors the telecoms company is prepared for a situation in which it loses ground to another bidder in February.
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If Elon Musk had peered out of his California office window last week he might have caught a glimpse of the new electric car that's set to challenge his Tesla brand's market dominance.
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The seller sent the phone to me straight away via Royal Mail's 'signed for' service. Unfortunately, on the day it was apparently delivered, my husband and I were both out. When I got home I saw online that the parcel had been delivered and signed for. I checked with my neighbours and looked for the parcel to no avail.
Royal Mail spoke to the driver who apparently said that he had left it in my mailbox. Savers can now get their hands on four new accounts from National Savings and Investments as it looks to attract more cash into the financial year. There are no guarantees in the world of investment but experience can be drawn on to help shape decision making.
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