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Friday

Friday. sound. The Doppler Effect. Tone Generator. Frog on a moving lily pad. the doppler effect. The Doppler Effect. Video: The Doppler Effect (1:56). The Doppler Effect. What does the Doppler effect have to do with stars?. wavelength in nanometres. 700. 650. 600. 550. 500. 400.

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Friday

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  1. Friday

  2. sound

  3. The Doppler Effect Tone Generator

  4. Frog on a moving lily pad

  5. the doppler effect

  6. The Doppler Effect Video: The Doppler Effect (1:56)

  7. The Doppler Effect What does the Doppler effect have to do with stars?

  8. wavelength in nanometres 700 650 600 550 500 400 red orange yellow green blue indigo violet color & wavelength

  9. emission spectra white light hydrogen helium neon

  10. laboratory spectrum of sodium red shift blue shift red-shift blue shift RED BLUE

  11. red-shift blue-shift

  12. Explore questions… http://curious.astro.cornell.edu/cosmology.php

  13. The Big Bang Theory Warmup: Explain the spectrum: Today Discussion & Video: “Back to the Beginning”

  14. Doppler Shift blue-shifted object –moving towards red-shifted object moving away

  15. The Balloon Analogy

  16. The Raisin Bread Analogy

  17. Three important observations • The expansion of the Universe. • Hubble: galaxies are receding. 1st evidence • 2. The abundance of light elements (H, He, Li) • B.Bang theory predicts these elements should have been fused from protons and neutrons in the first few minutes after the Big Bang. 3. Cosmic Microwave Background (CMB) Radiation • The early universe should have been very hot. The CMB radiation is the remnant heat leftover from the Big Bang.

  18. Cosmic Microwave Background

  19. Big Bang Timeline We are here

  20. Common Misconceptions • The Big Bang was an explosion. • The universe began as a point. • The universe is expanding into “something” and we are at the center of the expansion. • Galaxies are “flying away” in space.

  21. Predictions of a Big Bang Universe I: Hubble’s Law • Every point is receding away from every other point. Every point seems to be at the center of an expanding universe. • The farther away something is, the faster it is receding (unlike an explosion). • Farther away  looks redder (Doppler effect) • Relationship is linear: twice as far  receding twice as fast.

  22. Big Bang websites • For 2 students (& others?) • http://www.astro.ucla.edu/~wright/doppler.htm • http://science.howstuffworks.com/big-bang-theory.htm • “print” button --  this and next few pages • http://map.gsfc.nasa.gov/universe/bb_concepts.html • http://map.gsfc.nasa.gov/universe/WMAP_Universe.pdf • http://cosmology.berkeley.edu/Education/IUP/Big_Bang_Primer.html • http://curious.astro.cornell.edu/cosmology.php • Have students spend ~30 minutes reading through the questions. Write (1) new understandings (2) new questions • http://www.amtp.cam.ac.uk/user/gr/public/bb_home.html • http://curious.astro.cornell.edu/cosmology.php • http://www.umich.edu/~gs265/bigbang.htm

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