03 waves and er day 3
TRANSCRIPT
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PHYSICAL SCIENCEWaves and Electromagnetic Radiation
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Bell Ringer1.) The higher the ________ the more energy is in the wave.
2.) In ___________ waves, the medium vibrates at right angles to the direction of wave travel
3.) Wavelengths of the ER spectrum span from the size of a _______ field to sizes just a little bit larger than an _____
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Objectives For Today:
•Today we are:•Building an understanding of the electromagnetic spectrum
•Defining the relationship between wave AMPLITUDE and wave ENERGY
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Agenda/Announcements!
•Bell Ringer
•Electromagnetic Radiation and the light spectrum
•Build wave generator
•Finish work pages from yesterday
•HOMEWORK: Correction: Worksheets are due TOMORROW.
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What are waves?
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Electromagnetic Spectrum
© 2000 Microsoft Clip Gallery
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Electromagnetic Spectrum
•Visible Spectrum – Light we can see•Roy G. Biv – Acronym for Red, Orange, Yellow, Green, Blue, Indigo, & Violet.
•Largest to Smallest Wavelength.
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Modulating Radio Waves
•Modulation - variation of amplitude or frequency when waves are broadcast•AM – amplitude modulation
• Carries audio for T.V. Broadcasts•Longer wavelength so can bend around hills
•FM – frequency modulation •Carries video for T.V. Broadcasts
© 2000 Microsoft Clip Gallery
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Short Wavelength Microwave
•Invisible Spectrum (Cont.)•Infrared Rays
•Def – Light rays with longer wavelength than red light.
•Uses: Cooking, Medicine, T.V. remote controls
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Animals that can sense infra red
•Many vipers and beetles can sense infra-red rays.
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Electromagnetic Spectrum
•Invisible spectrum (cont.).•Ultraviolet rays.
•Def. – EM waves with frequencies slightly higher than visible light
•Uses: food processing & hospitals to kill germs’ cells
•Helps your body use vitamin D.
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The Mantis Shrimp – Different spectra
• Watch video
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Electromagnetic Spectrum
•Invisible Spectrum (Cont.)•X-Rays
• Def. - EM waves that are shorter than UV rays.• Uses: Medicine – Bones absorb x-rays; soft tissue does not.
• Lead absorbs X-rays.
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Electromagnetic Spectrum
•Invisible spectrum (cont.)•Gamma rays
•Def. Highest frequency EM waves; Shortest wavelength. They come from outer space.
•Uses: cancer treatment.
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LIGHT: Refraction of Light
•Refraction – Bending of light due to a change in speed. •Index of Refraction – Amount by which a material refracts light.
•Prisms – Glass that bends light. Different frequencies are bent different amounts & light is broken out into different colors.
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Refraction (Cont.)
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Ordering Activity
Who was following along?
Order the students by wavelength.
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AMPLITUDE vs. ENERGY
•Slinky – try making the amplitude twice as large...3 times as large…. What do you notice?
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AMPLITUDE vs. ENERGY
•SQUARED relationship. • IMPORTANT! What does this mean?
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Wave Generator
•Each group will add 10 straws to the wave generator. When finished, these will be used for review on Friday
•EACH STRAW NEEDS:•A paperclip on EACH end
•To be centered on the tape (IMPORTANT!)
•To be evenly spaced (about 1cm in between straws!)
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Wave Generator
•Each group will add 10 straws to the wave generator. When finished, these will be used for review on Friday
•EACH TABLE ASSEMBLY LINE:• Person 1 – Grab straw, pass to person 2
• Person 2 – Apply paperclip to one end – pass to person 3
• Person 3 – Apply paperclip to other end – pass to person 4
• Person 4 – apply straw to wave generator (start a top moving down)• *Person 1 can help apply straws since there will probably be a
bottleneck with person 4
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FINISHING HMWK
•Finished Hmwk goes in the Blue Folder. Thursday is the absolute last day it will be accepted
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Exit slip
•Give the wave generator a push at the top.
•How do you know that this is a transverse wave (think right angles…)
•Try changing the amplitude. What do you notice about the energy required to change the amplitude?