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.  Shows example of a wave (indicating change in wavelengths) 2  Arrows showing areas of higher and lower wavelengths, frequencies and energy. 6  The six types of EM Waves discussed in class 6  Drawings/pictures that represent the type of wave 6  Accurate ratios and division of page2  Creative/Artistic/Colorful/Neat/Professional 5  Totals /27

5. 4 square notes  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

6. 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

7. Wave Basics 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 Crest Trough Line of Equilibrium

8. 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

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

10. ? ?

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

12. 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 Parallel Vibration Perpendicular Vibration Direction of Energy

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

14. 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

15. Write these notes down…

16. 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

17.  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

18.  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

19.  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)

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

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

22. What type of wave interaction is this?

27.  http://media.pearsoncmg.com/aw/a w_0media_physics/hewittvideos/dop pler.html http://media.pearsoncmg.com/aw/a w_0media_physics/hewittvideos/dop pler.html

28. As a table  Summarize what the doppler effect is  Be ready to share

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

30. Electromagnetic Spectrum

31. Wavelength and the Spectrum

32. 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

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

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

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

37. 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

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

39. Ultraviolet (cont.) UVAUVB and UVC EnergyHighest of UV waves Lower than UVA Health risks  Extremely low risk for DNA damage  Can destroy Vitamin A in skin  Can cause DNA damage, leading to skin cancer  Responsible for sunburn

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

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

42. Image credits 1. http://www.antonine- education.co.uk/New_items/MUS/images/Making6.gif http://www.antonine- education.co.uk/New_items/MUS/images/Making6.gif 2. http://www.geocities.com/researchtriangle/campus/6791/einste in12.jpg http://www.geocities.com/researchtriangle/campus/6791/einste in12.jpg 3. http://abyss.uoregon.edu/~js/glossary/wave_particle.html http://abyss.uoregon.edu/~js/glossary/wave_particle.html 4. http://www.astro.princeton.edu/~gk/A402/electromagnetic_spe ctrum.jpg http://www.astro.princeton.edu/~gk/A402/electromagnetic_spe ctrum.jpg 5. http://science.hq.nasa.gov/kids/imagers/ems/radio.html http://science.hq.nasa.gov/kids/imagers/ems/radio.html 6. http://www.nentjes.info/Palace/radio-6.gif http://www.nentjes.info/Palace/radio-6.gif 7. http://www.mobilewhack.com/motorola-h12-bluetooth- headset.jpg http://www.mobilewhack.com/motorola-h12-bluetooth- headset.jpg 8. http://www.stuffintheair.com/radar-real-time-weather.html http://www.stuffintheair.com/radar-real-time-weather.html 9. http://www.imaging1.com/gallery/images/AV%20Night%20visi on%20goggles.jpg http://www.imaging1.com/gallery/images/AV%20Night%20visi on%20goggles.jpg 10. http://www.global-b2b- network.com/direct/dbimage/50329753/Study_Remote_Control.jpg http://www.global-b2b- network.com/direct/dbimage/50329753/Study_Remote_Control.jpg 11. http://www.georgiaprismaward.com/The_Prism_Story_files/PRI SM%20brand%20imagemed.jpg http://www.georgiaprismaward.com/The_Prism_Story_files/PRI SM%20brand%20imagemed.jpg 12. http://science.hq.nasa.gov/kids/imagers/ems/uv.html http://science.hq.nasa.gov/kids/imagers/ems/uv.html

43. Image Credits 13. http://farm3.static.flickr.com/2385/2381723771_12548f 4bd1.jpg?v=1217429879 http://farm3.static.flickr.com/2385/2381723771_12548f 4bd1.jpg?v=1217429879 14. http://intamod.com.au/images/uv2.JPG http://intamod.com.au/images/uv2.JPG 15. http://science.hq.nasa.gov/kids/imagers/ems/xrays.html http://science.hq.nasa.gov/kids/imagers/ems/xrays.html 16. http://www.sciencelearn.org.nz/var/sciencelearn/storage /images/contexts/see_through_body/sci_media/neck_x_r ay/17945-5-eng-NZ/neck_x_ray_full_size_portrait.jpg http://www.sciencelearn.org.nz/var/sciencelearn/storage /images/contexts/see_through_body/sci_media/neck_x_r ay/17945-5-eng-NZ/neck_x_ray_full_size_portrait.jpg 17. http://www.epinion.eu/wordpress/wp- content/uploads/2008/05/airport-security1.jpg http://www.epinion.eu/wordpress/wp- content/uploads/2008/05/airport-security1.jpg 18. http://science.hq.nasa.gov/kids/imagers/ems/gamma.ht ml http://science.hq.nasa.gov/kids/imagers/ems/gamma.ht ml 19. http://www.aboutnuclear.org/print.cgi?fC=Food http://www.aboutnuclear.org/print.cgi?fC=Food 20. http://www.roswellpark.org/files/1_2_1/brain_spinal/ga mma%20knife%204c.jpg http://www.roswellpark.org/files/1_2_1/brain_spinal/ga mma%20knife%204c.jpg