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Doppler Effect and Big Bang Theory Explained

Learn about the Doppler Effect, its connection to the Big Bang Theory, and explore the evidence and predictions of a Big Bang Universe. Includes quizzes, videos, and discussion.

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Doppler Effect and Big Bang Theory Explained

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  1. Quiz: To Earn ½ Points Back: On another sheet of paper: • Write the correct answer and explain WHY this is the correct answer. OR 2. Give another example of the same kind of thing (or expand on the info.).

  2. 10/19 Doppler Effect ALSO: Tape in pictures from Friday Warmup: 1. Draw: Draw and label 2 waves, one high frequency and one low frequency. 2. Discuss: What does a train whistle or car horn sound like as it approaches then moves past? Today 1. The Doppler Effect: Demo, Discussion, Videos 2. Quiz back, grades 3. Current Event

  3. Friday

  4. sound

  5. The Doppler Effect Tone Generator

  6. Frog on a moving lily pad

  7. the doppler effect

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

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

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

  11. emission spectra white light hydrogen helium neon

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

  13. red-shift blue-shift

  14. Summary Notes on the Doppler Effect • 3-minute Quick Write Video: Red Shift (2:15)

  15. Edwin Hubble, 1920’s. • If all galaxies are receding, the logical conclusion is the universe is expanding. • If the universe is expanding, what if we run time backwards? • Universe would have been smaller, more dense… infinitely so? Two conflicting theories of Universe origins: • Steady State • The Big Bang

  16. 10/22 TEST REVIEW Warmup: 1. Turn in Current Event 2. Mark your notes from the last 2 days: = most interesting thing Circle = helped me understand Big Bang ? = I’d still like to know more Today 1. Big Bang Review 2. Unit Review for Test

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

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

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

  20. The Balloon Analogy

  21. The Raisin Bread Analogy

  22. Big Bang Theory Honors CS • Video: BBC video on Steady State (Hoyle) vs Big Bang (Gamov)

  23. Big Bang Theory • Models of the Universe pages from Big Bang book (S.Singh) p. 68-69 Earth vs. Sun-Centered p. 370-371 BigBang vs Steady State

  24. Big Bang Theory • Video: Back to the Beginning (portion)

  25. 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.

  26. Cosmic Microwave Background

  27. Big Bang Timeline We are here

  28. 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.

  29. 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.

  30. 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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