waves, sound, electromagnetic radiation
DESCRIPTION
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) - PowerPoint PPT PresentationTRANSCRIPT
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Waves, sound, Electromagnetic Radiation
Conceptual Physics
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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…
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Self-grade… Go over answers on your webquests 18 pts each answer
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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 page 2
Creative/Artistic/Colorful/Neat/Professional 5
Totals /27
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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
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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
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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
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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
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Vibrate – particle moving – produces energy – transfers energy to nearby particles – wave Ocean, ropes, sound, microwaves
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?
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Waves… a reviewMost waves are either
longitudinal or transverse.Sound waves are longitudinal.But all electromagnetic waves
are transverse…
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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
Direction of Energy
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Amplitude = amount of energy Frequency = number of waves in
given time (Hz – 1 Hz=1 wave/sec)
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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
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Write these notes down…
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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
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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
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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
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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)
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What wave interaction is happening to the spoon in the water?
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What type of wave interaction is this?
Car headlights with open eyes
Car headlights with squinted eyelashes
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What type of wave interaction is this?
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What type of wave interaction is this?
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What type of wave interaction is this?
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What type of wave interaction is this?
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What type of wave interaction is this?
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http://media.pearsoncmg.com/aw/aw_0media_physics/hewittvideos/doppler.html
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As a table Summarize what the doppler effect is Be ready to share
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Doppler Apparent change in pitch caused by
motion As moving towards me, pitch is
higher As moving away from me, pitch is
lower
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Electromagnetic Spectrum
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Wavelength and the Spectrum
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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
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Radio waves Longest wavelength EM waves Uses:
TV broadcasting AM and FM broadcast radio Avalanche beacons Heart rate monitors Cell phone communication
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Microwaves Wavelengths from 1 mm- 1 m Uses:
Microwave ovens Bluetooth headsets Broadband Wireless Internet Radar GPS
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Infrared Radiation Wavelengths in between microwaves
and visible light Uses:
Night vision goggles Remote controls Heat-seeking missiles
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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
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Ultraviolet Shorter wavelengths than visible
light Uses:
Black lights Sterilizing medical equipment Water disinfection Security images on money
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Ultraviolet (cont.)UVA UVB and UVC
Energy Highest 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
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X-rays Tiny wavelength, high
energy waves Uses:
Medical imaging Airport security Inspecting industrial welds
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Gamma Rays Smallest wavelengths, highest
energy EM waves Uses
Food irradiation Cancer treatment Treating wood flooring
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Image credits1. http://www.antonine-education.co.uk/New_items/MUS/images/M
aking6.gif2. http://www.geocities.com/researchtriangle/campus/6791/einstei
n12.jpg3. http://abyss.uoregon.edu/~js/glossary/wave_particle.html4. http://www.astro.princeton.edu/~gk/A402/electromagnetic_spec
trum.jpg5. http://science.hq.nasa.gov/kids/imagers/ems/radio.html6. http://www.nentjes.info/Palace/radio-6.gif7. http://www.mobilewhack.com/motorola-h12-bluetooth-headset.j
pg8. http://www.stuffintheair.com/radar-real-time-weather.html9. http://www.imaging1.com/gallery/images/AV%20Night%20vision
%20goggles.jpg10. http://www.global-b2b-network.com/direct/dbimage/50329753/S
tudy_Remote_Control.jpg11. http://www.georgiaprismaward.com/The_Prism_Story_files/PRIS
M%20brand%20imagemed.jpg12. http://science.hq.nasa.gov/kids/imagers/ems/uv.html
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Image Credits13. http://farm3.static.flickr.com/2385/2381723771_12548f4b
d1.jpg?v=121742987914. http://intamod.com.au/images/uv2.JPG15. http://science.hq.nasa.gov/kids/imagers/ems/xrays.html16. 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
17. http://www.epinion.eu/wordpress/wp-content/uploads/2008/05/airport-security1.jpg
18. http://science.hq.nasa.gov/kids/imagers/ems/gamma.html19. http://www.aboutnuclear.org/print.cgi?fC=Food20. http://www.roswellpark.org/files/1_2_1/brain_spinal/
gamma%20knife%204c.jpg