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Electromagnetic spectrum #1
- 1. Electromagnetic Radiation
- 2. Science Standard S8P5: Students willexplore the wave nature of sound and electromagnetic radiation.
- 3. Essential Question What aresome everyday uses of electromagnetic radiation (or waves)?
- 4. Waves… a review Most waves are either longitudinal or transverse. Sound waves are longitudinal. But all electromagnetic waves are transverse…
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- 6. Electromagnetic waves Produced by the movement of electrically charged particles Cantravel in a “vacuum” (they do NOT need a medium)
- 7. Electromagnetic waves Travelatthe speed of light (300,000,000 m/s in a vacuum ) * Travels slower when passing through a medium Also known as EM waves because they are surrounded by: i.Electric fields ii.Magnetic fields
- 8. Wave-particle Duality Lightcanbehave like a wave or like a particle Travels in bundles of energy Bundles act like small particles A “particle” of light is called a photon
- 9. Wave-particle Duality Allelectromagneticwaves travel at the same speed Frequency and wavelength are used to classify the waves in the electromagnetic spectrum
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- 11. Electromagnetic Spectrum The electromagnetic spectrum is the complete range of electromagnetic waves placed in order of increasing frequency.
- 12. Electromagnetic Spectrum
- 14. Electromagnetic Spectrum Asthe frequency increases: a.Wavelength decreases b.Photon penetrating energy increases
- 15. Radio waves Longest wavelength EM waves Low Frequency & Lowest Photon Energy Uses: TV broadcasting AM and FM broadcast radio Avalanche beacons Heart rate monitors Cell phone communication
- 16. Microwaves Wavelengths from 1 mm- 1 m Uses: Microwave ovens Bluetooth headsets Broadband Wireless Internet Radar GPS
- 17. Infrared Radiation Wavelengths in between microwaves and visible light Uses: Night vision goggles Remote controls Thermal Energy Transfer Heat-seeking missiles
- 18. Visible light Only type of EM wave able to be detected by the human eye Violet is the highest frequency light Red light is the lowest frequency light Only EM we can see
- 19. Ultraviolet Shorterwavelengths &higher frequency than visible light Uses: Black lights Sterilizing medical equipment Water disinfection Produces vitamin D in human skin Security images on money
- 20. X-rays Tinywavelength, high energywaves – greater penetrating power Uses: Medical imaging Airport security Inspecting industrial welds
- 21. Gamma Rays Smallestwavelengths,highest energy EM waves Uses Food irradiation Cancer treatment Treating wood flooring
- 22. Light and Color Typeof matter in an object determines the amount of light it absorbs and reflects.
- 23. Can it ReflectLight? What types of objects or materials can reflect light? Put an X next to the things you think can reflect light. Explain your thinking. Describe the “rule” or the reasoning you used to decide if something can reflect light. ___ water ___ red apple ___ gray rock ___ rough cardboard ___ leaf ___ the Moon ___ mirror ___ rusty nail ___ glass ___ clouds ___ sand ___ soil ___ potato skin ___ milk ___ wax paper ___ bedsheet ___ tomato soup ___ brand new penny ___ crumpled paper ___ wood ___ shiny metal ___ old tarnished penny ___ dull metal ___ smooth sheet of aluminum foil
- 24. Light and Color 1.Opaquematerials – absorbs or reflects all light, you can not see through them 2.Transparent materials – allow light to pass through, you can see through them 3.Translucent materials – allow some of the light to pass through; you can not clearly see objects through them
- 25. Visible Light Spectrum Light waves in the visible spectrum arranged from longest wavelength to shortest wavelength. Red Orange Yellow Green Blue Indigo Violet
- 26. Light and Color Thecolor appearance of any object is due to the wavelengths of light that are reflected from the object and picked up by our eyes.
- 27. Light and Color 1.White reflectsall the colors of the visible spectrum. 2.Black objects absorb all the colors of the visible spectrum.
- 28. Lenses Bend Light Lensesare used in microscopes, telescopes, binoculars, cameras, magnifying glasses, and eyeglasses.
- 29. The Refraction ofLight When light travels from some transparent substances through others –like air into water or glass into air, the light bends. Convex Lenses Concave Lenses Prisms
- 30. Convex Lenses A magnifying glass is an example of a convex lens. A convex lens is thicker in the middle of the lens than it is at the ends. A convex lens bends the light and makes the object look larger or magnify it.
- 31. Concave Lenses A concave lens is thinner in the middle than at the ends. Concave lenses cause the light to spread out after light passes through them. Concave lenses are used in glasses for people who are short-sighted or cannot clearly see things far away.
- 32. Prisms A prismbends the light in such a way that it separates it into different parts. Normal white light contains all the colors of the rainbow. Prisms can separate the different colors because each color bends differently when it passes through a prism.