Se ha denunciado esta presentación.
8 de may. de 2013
The Spectacular SpectrumUnderstanding the Electromagnetic Spectrumhttp://www.youtube.com/watch?v=cfXzwh3KadE
Key Objectives:Key Objectives:The student will:– investigate and understandthe nature and applications ofelectromagnetic waves
Key Objectives:Key Objectives:The student will:– Compare various types ofwaves in the electromagneticspectrum in terms ofwavelength, frequency andenergy
Key Objectives:Key Objectives:The student will :– Describe everydayapplications of each of themajor forms ofelectromagnetic radiation
Key Objectives:Key Objectives:The student will :– Recognize thatelectromagnetic waves are aform of radiant energy notrequiring a medium to travel
Key TermsKey TermsElectromagneticSpectrumElectromagneticWavesMicrowavesInfrared WavesVisible lightUltraviolet LightX-RaysGamma Rays
Electromagnetic SpectrumThis electromagnetic spectrum(EMS) is the radiant energyreleased from the sun.
Electromagnetic SpectrumIt travels at the speed of lightthrough space and includes alltypes of electromagnetic waves
Electromagnetic SpectrumThere are seven types ofelectromagnetic waves in theEMSRadio WavesMicrowavesInfrared WavesVisible Light WavesUltraviolet WavesX-RaysGamma Rays
Radio Waves The electromagneticwaves with thelowest frequency. Used to transmitradio and televisionsignals (BeforeDigital TV) The largest bandmaking 20 %20 % of theEMS
Microwaves The secondfrequency level of theEMS. Used to send cellphone signals and tocook food Make up 15%15% of theEMS
Infrared waves The level just beneathvisible light. It measures heat as itreflects off objects. Night vision gogglesuse it to see objects intotal darkness. Make up 13%13% of theEMS
Visible light The smallestsection about9%9% of the EMS. It allows us tosee. ROYGBIV
The Visible Light Spectrum(Wavelengths)
Ultraviolet Light Means above violet light on thevisible light spectrum so itcannot be seen. Makes up 12% of theEMS If unprotected itmay cause:– sunburn– skin cancer
X-Rays Make up 16%16% of the totalEMS X-Rays can passthrough manysubstances. Lead is one of a fewsubstances that preventthe transfer of X-Rays
X-Ray of Hands
Gamma Rays The highest frequency of the EMS. Makingup 15%15% of the EMS, Very dangerous butstill can be used for cancer cures.
Lab Time Carefully read andcomplete eachactivity from the labguide. You have 45minutes
Essential LearningsAll Electromagnetic wavesoriginally come from the sun
Essential LearningsAll electromagnetic waves arearranged on the electromagneticspectrum by wavelength andfrequency
Essential LearningsThe Electromagnetic Spectrumincludes seven different types of waves– Radio Waves– Microwaves– Infrared Waves– Visible Light– Ultraviolet Light– X-Rays– Gamma rays
Essential LearningsRadio waves are the lowestenergy level w/ lowestfrequency and have the longestwavelength
Essential LearningsGamma rays are the highestlevel w/ highest frequency andthe shortest wavelength
Essential LearningsAll types of electromagneticradiation travel at the speed oflight in space (which is avacuum).They differ at wavelengths andfrequencies
Essential LearningsElectromagnetic Radiationtravels as transverse wavesand does not require a mediumin which to travel
Essential LearningsThe End!