A Room With A View Electromagnetic Spectrum - Weebly

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A Room With A ViewElectromagnetic SpectrumActivity 2 of 3Grade Level: 5 – 8Subject: SciencePrep time: 10 minutesActivity Duration: One class period (55 minutes)Materials category: General ClassroomNational Education aphy3c, 6aObjective: Be introduced to the Electromagnetic Spectrum and realize thatthere is energy beyond visible light that we cannot see.They will also identify examples of parts of the EM Spectrum.Materials: PrismStrong flashlightCrayons or markers Computer with Web Access (optional)Related Links:NASA Site Used for derivation of Lesson PlanElectromagnetic magers Education Site at Goddard Space Flight Centerhttp://imagers.gsfc.nasa.gov/Supporting NASAexplores Article(s):A Room With A Viewhttp://www.nasaexplores.com/share2 articlea.php?id 01-004

A Room With A ViewElectromagnetic SpectrumTeacher SheetsPre-activity Instructions IMAGERS Electromagnetic Spectrum web site - Preview the electromagneticspectrum web site the day before teaching this lesson. Find objects to representdifferent electro-magnetic energy, i.e. pocket radio, microwave popcorn, remotecontrol, etc. Wavestown activity - You may want to review the answers to this activity prior tothe lesson because some answers may surprise you. Optional student sheets are for those with no web access are included below.Background InformationAsk students “what is light?” White light is all colors, like the colors of the rainbow.Explain that Isaac Newton discovered the color of light by shining white light through aprism. Demonstrate his experiment using a flashlight and a prism. Tell students that thisis called the “visible light spectrum.” The visible light spectrum is a part of a largerspectrum called the electromagnetic spectrum. Explain that light is energy and that thereis energy beyond visible light. In this lesson, they will be studying the electromagneticspectrum. The WORF will let waves that are outside the visible light spectrum passthrough ensuring high quality photographs.Activity Guidelines1. Read and talk about the article.2. Take students to computer lab.3. Begin on the IMAGERS Student’s Site (http://imagers.gsfc.nasa.gov/student.html) and select the Electromagnetic Spectrum site.3. Read the first page titled “What are waves?” together.4. Give each student the Wavestown picture.5. Have students use the electromagnetic spectrum site to help them label examplesof the electromagnetic spectrum found in Wavestown. Students should read thedescription on the site then look for examples in Wavestown.(NOTE: If access to computer lab is unavailable, use the attached reading below.)Discussion / Wrap-upWhen students complete this exercise, discuss their answers as a class. Begin with radiowaves. Ask students to give examples found in Wavestown. Continue with microwavesand the other wavelengths to gamma rays.

Wavestown Answer KeyRadio WavesRay’s TV - TV reception uses radio wavesSatellite Dish on top Ray’s - receives movies via radio waves from a satelliteTaxi - Car radio reception uses radio signalsTaxi - Driver receives instructions on a CB radio which uses radio wavesRadio Tower - broadcast’s radio signalsLarge Satellite dish in field - receives radio waves from distant starsMicrowavesMicrowave in Waves Grill - uses microwaves to cook foodDisk-like antennas on tower - send microwave communicationsInfraredHeat lamps above food in Waves Grill - use infrared waves to keep food hotRay’s TV - Remote controls use infrared waves to communicate with the TVTrees, bushes, grass, and farm - vegetation reflects short infrared wavesObservatory - astronomers study thermal infrared (long infrared waves) from starsVisible LightRainbow - water droplets cause white light to break apart into the colors of the rainbowPhotographer’s studio - portrait photographers use film sensitive to visible lightObservatory - astronomers look at visible light from planets and starsUltravioletTanning Salon - use ultraviolet waves to tan our skinsunglasses store - sunglasses protect our eyes from the ultraviolet wavesSuntan lotion - protects our skin from ultraviolet wavesObservatory - astronomers see some ultraviolet radiation from planets and starsX-raysDr. Bob’s Health Clinic - uses x-rays to study our bonesHigh energy x-rays are also used to treat cancerGamma RaysDr. Bob’s Health Clinic - gamma radiation is used to kill sick cells through nuclearmedicine.Gamma radiation is given off by nuclear explosions that occur within stars, like our sun.Note: Stars give off gamma rays and x-rays but we cannot see them from Earth becausethey cannot pass through our atmosphere

What are waves?Have you ever ridden a wave in the ocean?Ocean waves travel on the surface of the water. Youcan see them and you can feel them. As you swimthrough the water, you can even make your ownwaves.Have you ever seen a flag on a windy day?The wind creates waves in the flag. Both the waves in the flag and the ocean waves arewaves that you can see. There are other kinds of waves. We cannot see these waves, butwe experience them every day. These waves are called electromagnetic waves.What are electromagnetic waves?Electricity can be static, like what holds aballoon to the wall or makes your hair standon end. Magnetism can also be static like arefrigerator magnet. But when they changeor move together, they make waves electromagnetic waves.Electromagnetic waves are formed when anelectric field couples with a magnetic field.Magnetic and electric fields of anelectromagnetic wave are perpendicular toeach other and to the direction of the wave.James Clerk Maxwell and Heinrich Hertzare two scientists who studied howelectromagnetic waves are formed and howfast they travel.Sound also travels in waves, though we can't see them. Like ocean waves, sound wavesneed a medium to travel through. Sound travels through air - and can even travel throughwater! There is no sound in space because there is nothing there to transmit the soundwaves. This is why astronauts on spacewalks use radios to communicate. Radio wavesare a type of electromagnetic wave.Electromagnetic waves do not need anything to travel through. They can travel throughempty space. They can also travel through air and even through solid materials.

Electromagnetic Waves have different wavelengths.When you listen to the radio, watch TV, orcook dinner in a microwave oven, you areusing electromagnetic waves.Radio waves, television waves, andmicrowaves are all types ofelectromagnetic waves. They only differfrom each other in wavelength.Wavelength is the distance between onewave crest to the next.Waves in the electromagnetic spectrum vary in size from very long radio waves the sizeof buildings, to very short gamma rays smaller than the size of the nucleus of an atom.Did you know that electromagnetic waves can not only be described by their wavelength,but also by their energy and frequency? All three of these things are related to each othermathematically. This means that it is correct to talk about the energy of an X-ray or thewavelength of a microwave or the frequency of a radio wave.

A Room With A ViewElectromagnetic SpectrumStudent SheetsDirections: Use the descriptions below to help locate examples of electromagneticwaves in the Wavestown picture.Radio waves have the longest wavelength in the electromagnetic spectrum. These wavescarry the news, ball games, and music you listen to on the radio. They also carry signalsto television sets and cellular phones.Microwaves have shorter wavelengths than radio waves, which heat the food we eat.They are also used for radar images, like the Doppler radar used in weather forecasts.There are infrared waves with long wavelengths and short wavelengths. Infrared waveswith long wavelengths are different from infrared waves with short wavelengths.Infrared waves with long wavelengths can be detected as heat. Your radiator or heatergives off these long infrared waves. We call these thermal infrared or far infrared waves.The sun gives off infrared waves with shorter wavelengths. Plants reflect these waves,also known as near infrared waves.Visible light waves are the only electromagnetic waves we can see. We see these wavesas the colors of the rainbow. Each color has a different wavelength. Red has the longestwavelength and violet has the shortest wavelength. These waves combine to make whitelight.Ultraviolet waves have wavelengths shorter than visible light waves. These waves areinvisible to the human eye, but some insects can see them. Of the sun’s light, theultraviolet waves are responsible for causing our sunburns.X-Rays: As wavelengths get smaller, the waves have more energy. X-Rays have smallerwavelengths and therefore more energy than the ultraviolet waves. X-Rays are sopowerful that they pass easily through the skin allowing doctors to look at our bones.Gamma Rays have the smallest wavelength and the most energy of the waves in theelectromagnetic spectrum. These waves are generated by radioactive atoms and innuclear explosions. Gamma rays can kill living cells, but doctors can use gamma rays tokill diseased cells.

µm4.0.3µm30nm5.3nm6.0.3nm0.03nm 0.003nm7.Label the chart below, thenmatch the items in the pictureto the Electromagnetic Spectrum.NameDateWavestown

Wavestown Answer Key Radio Waves Ray’s TV - TV reception uses radio waves Satellite Dish on top Ray’s - receives movies via radio waves from a satellite Taxi - Car radio reception uses radio signals Taxi - Driver receives instructions on a CB radio which uses radio waves Radio Tower - broadcast’s radio signals

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