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Waves, sound, Electromagnetic Radiation

Waves, sound, Electromagnetic Radiation. Conceptual Physics      . To do…. See how many of the quiz topics you can answer as a table group (if you don’t know the answer right away, seek out the answer with your notes/webquests/EM poster)

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Waves, sound, Electromagnetic Radiation

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  1. Waves, sound, Electromagnetic Radiation Conceptual Physics 

  2. To do… • See how many of the quiz topics you can answer as a table group • (if you don’t know the answer right away, seek out the answer with your notes/webquests/EM poster) • Identify which questions your table can’t answer • Pick your top 2 topics that you need to review today…

  3. Self-grade… • Go over answers on your webquests • 18 pts each answer

  4. 5 pts each page Definition = 1 Real world ex = 2 Picture = 1 3-5 facts = 2 Total = 30 pts Radio Infrared Visible light Uv X-rays Gamma rays 4 square notes

  5. Next 10 minutes • Interactive review • Do NOT write for next 10 minutes • Stop – share with table group all the information you think is important for quiz, what information was clarified for you

  6. Wave Basics Crest Line of Equilibrium Trough Key Vocab. -Amplitude: The maximum displacement of a wave from equillibrium (height of a wave) -Wavelength: The length of one full wave cycle or repetition -Period: The amount of time it takes a wave to complete one full cycle -Frequency: The number of wave vibrations/repetitions per second (Hz) -Equilibrium: The resting place of a wave with no disturbance -Crest: The highest point or peak of a wave -Trough: The lowest point or bottom of a wave

  7. Basics • Waves- traveling disturbance that carries energy (not matter) • Boat/wave example • Energy = ability to do work • Vibration: any movement follows same path repeatedly • Ear drum, drum, earthquake

  8. Vibrate – particle moving – produces energy – transfers energy to nearby particles – wave • Ocean, ropes, sound, microwaves

  9. ? ?

  10. Waves… a review • Most waves are either longitudinal or transverse. • Sound waves are longitudinal. • But all electromagnetic waves are transverse…

  11. Wave Types • A wave is a traveling disturbance that transfers energy. • 2 Types of Waves: • Transverse: side to side wave sending vibration perpendicular to the medium • Longitudinal: push & pull wave sending vibration parallel to the medium Perpendicular Vibration Direction of Energy Parallel Vibration Direction of Energy

  12. Amplitude = amount of energy • Frequency = number of waves in given time (Hz – 1 Hz=1 wave/sec)

  13. Speed of wave • Speed = freq x wavelength (λ) • Depends on medium its traveling in • Density (moves slower) – more inertia • Elasticity (faster) – faster in solid than liquid/gas • temperature

  14. Write these notes down…

  15. Key Vocab for Wave interactions • Reflection – bouncing back of a wave after it strikes a boundary that does not absorb all the wave’s energy • Ray is a line drawn to show direction of a wave and show wave activity • Incident – incoming wave • Reflected wave – wave being bounced back

  16. Refraction – bending of waves due to a change in speed (occurs because waves move at different speeds in different mediums) – air to water, glass to air

  17. Diffraction – bending of waves around the edge of an obstacle • The amount of diffraction depends on the wave length and the size of obstacle • Snowball vs. yelling

  18. Interference – When 2 or more waves arrive at the same place at the same time – they combine to form a single wave • Constructive = combine (larger amplitude) • Destructive = cancel (no wave)

  19. What wave interaction is happening to the spoon in the water?

  20. What type of wave interaction is this? Car headlights with open eyes Car headlights with squinted eyelashes

  21. What type of wave interaction is this?

  22. What type of wave interaction is this?

  23. What type of wave interaction is this?

  24. What type of wave interaction is this?

  25. What type of wave interaction is this?

  26. http://media.pearsoncmg.com/aw/aw_0media_physics/hewittvideos/doppler.htmlhttp://media.pearsoncmg.com/aw/aw_0media_physics/hewittvideos/doppler.html

  27. As a table • Summarize what the doppler effect is • Be ready to share

  28. Doppler • Apparent change in pitch caused by motion • As moving towards me, pitch is higher • As moving away from me, pitch is lower

  29. Electromagnetic Spectrum

  30. Wavelength and the Spectrum

  31. Electromagnetic waves • Produced by the movement of electrically charged particles • Can travel in a “vacuum” (they do NOT need a medium • Travel at the speed of light • Also known as EM waves

  32. Radio waves • Longest wavelength EM waves • Uses: • TV broadcasting • AM and FM broadcast radio • Avalanche beacons • Heart rate monitors • Cell phone communication

  33. Microwaves • Wavelengths from 1 mm- 1 m • Uses: • Microwave ovens • Bluetooth headsets • Broadband Wireless Internet • Radar • GPS

  34. Infrared Radiation • Wavelengths in between microwaves and visible light • Uses: • Night vision goggles • Remote controls • Heat-seeking missiles

  35. 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

  36. Ultraviolet • Shorter wavelengths than visible light • Uses: • Black lights • Sterilizing medical equipment • Water disinfection • Security images on money

  37. Ultraviolet (cont.)

  38. X-rays • Tiny wavelength, high energy waves • Uses: • Medical imaging • Airport security • Inspecting industrial welds

  39. Gamma Rays • Smallest wavelengths, highest energy EM waves • Uses • Food irradiation • Cancer treatment • Treating wood flooring

  40. Image credits • http://www.antonine-education.co.uk/New_items/MUS/images/Making6.gif • http://www.geocities.com/researchtriangle/campus/6791/einstein12.jpg • http://abyss.uoregon.edu/~js/glossary/wave_particle.html • http://www.astro.princeton.edu/~gk/A402/electromagnetic_spectrum.jpg • http://science.hq.nasa.gov/kids/imagers/ems/radio.html • http://www.nentjes.info/Palace/radio-6.gif • http://www.mobilewhack.com/motorola-h12-bluetooth-headset.jpg • http://www.stuffintheair.com/radar-real-time-weather.html • http://www.imaging1.com/gallery/images/AV%20Night%20vision%20goggles.jpg • http://www.global-b2b-network.com/direct/dbimage/50329753/Study_Remote_Control.jpg • http://www.georgiaprismaward.com/The_Prism_Story_files/PRISM%20brand%20imagemed.jpg • http://science.hq.nasa.gov/kids/imagers/ems/uv.html

  41. Image Credits • http://farm3.static.flickr.com/2385/2381723771_12548f4bd1.jpg?v=1217429879 • http://intamod.com.au/images/uv2.JPG • http://science.hq.nasa.gov/kids/imagers/ems/xrays.html • http://www.sciencelearn.org.nz/var/sciencelearn/storage/images/contexts/see_through_body/sci_media/neck_x_ray/17945-5-eng-NZ/neck_x_ray_full_size_portrait.jpg • http://www.epinion.eu/wordpress/wp-content/uploads/2008/05/airport-security1.jpg • http://science.hq.nasa.gov/kids/imagers/ems/gamma.html • http://www.aboutnuclear.org/print.cgi?fC=Food • http://www.roswellpark.org/files/1_2_1/brain_spinal/gamma%20knife%204c.jpg

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