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Warm-Up: March 9/10, 2016

Warm-Up: March 9/10, 2016. An electromagnetic wave is traveling through earth’s atmosphere with a frequency of 1.21 GHz. What is its period? What is its speed? What is its wavelength ? How would you categorize this EM wave?. Homework Questions?. Wave Properties. Properties of Waves.

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Warm-Up: March 9/10, 2016

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  1. Warm-Up: March 9/10, 2016 • An electromagnetic wave is traveling through earth’s atmosphere with a frequency of 1.21 GHz. • What is its period? • What is its speed? • What is its wavelength? • How would you categorize this EM wave?

  2. Homework Questions?

  3. Wave Properties

  4. Properties of Waves • Doppler Effect • Polarization • Refraction • Interference • Diffraction • Reflection

  5. Doppler Effect • The Doppler Effect is a change in frequency caused by a relative motion between the noise source and the detector. • The change in frequency causes a corresponding change in period and wavelength • Light: the “blue-shift” or “red-shift” is used to tell if stars are moving towards us or away

  6. Polarization • A transverse wave is polarized if it is only allowed to oscillate in one direction. • Light: polarization filters or reflection • Sound: longitudinal waves cannot be polarized

  7. Refraction • Refraction is a bending of a wave when it travels from one medium to another. • Refraction only occurs if the speed of the wave is different in the two media • The index of refraction is related to wave speed and can help us calculate how much the wave will refract

  8. Refraction Picture, page 486

  9. Interference • When two waves superpose, the result is called interference. • http://phet.colorado.edu/en/simulation/legacy/wave-interference • Sound: PhET simulation • http://phet.colorado.edu/en/simulation/legacy/sound • Light: If monochromatic light passes through a double slit (two nearby holes), it will produce bands of light and dark • Constructive interferenceis when the waves build on each other (i.e., crest meets crest) • Destructive interference is when waves cancel each other (i.e., crest meets trough)

  10. Page 528

  11. Diffraction • Diffraction is the spreading out of a wave • Sound: can travel around corners • Light: spreads out after passing through a slit • Different colors of light diffract different amounts, creating a rainbow pattern

  12. Reflection • Reflection is when a wave bounces off of the boundary of a medium. • Sound: bounces off walls • Echoes • The Oval Office • Light: most of what we see is due to the reflection of light

  13. PhET Simulations • Bending Light – Reflection and refraction • http://phet.colorado.edu/en/simulation/bending-light • Wave Interference – Sound and Light • http://phet.colorado.edu/en/simulation/legacy/wave-interference • Sound – Interference and more • http://phet.colorado.edu/en/simulation/legacy/wave-interference

  14. Assignments • Wave Properties worksheet • Waves Review

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