1. Big Bang Theory
Created By:
Mr. Kreeger

2. Homework and Page References
Page References- Page 7-11 HW
6-11 on page 11
Handout if not finished in class

3. Table of Contents Theory versus Law The Mystery behind light
Doppler Effect
Red Shift
Big Bang Theory

4. 1. Theory vs. Law
Theory- Provides a general explanation for scientific observations that is consistent with known facts. (i.e. Einstein’s theory of Relativity)
Law- This is a rule that correctly describes a natural phenomenon, must be proven correct every time. (i.e. Gravity, law of conservation of energy, mass and momentum)

5. 2. Mystery of Light
Light

6. 2. Mystery of light
White light/ Sunlight passing through a prism is split into 7 colors (ROY G BIV)
Light travels in waves, each color has a different wavelength. Red is longest and violet is shortest.

7. Doppler Effect video
Doppler Effect

8. 3. Doppler Effect
When a light source is moving toward an observer, the wavelength of light is compressed and are shortened
Spectral lines shift toward shorter wavelengths (Blue Shift)
When a light source is moving away from an observer, the wavelength of light expands and are lengthened.
Spectral lines shift toward longer wavelengths (Red shifted)

9. 4. Red Shift
Using a spectroscope scientist can determine which elements are present in stars. (92% H2, 8% He)
When doing this they found most spectrums of the stars were red shifted. Most galaxies were moving away from earth.
Degree of red shift determines how fast it is moving, most distant, fastest
Doppler Shift

10. 5. Big Bang Theory
Billions of years ago all matter and energy in universe was compressed into small volume
17 billion years ago sudden event sent all matter and energy outward
Big bang theory

11. Cosmic Radiation in support of the Big Bang Theory
Wilson and Penzias with their historic horned antenna at Crawford Hill, N.J.
Cosmic Radiation