Big Bang Theory

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Big Bang Theory

• Created By
• Mr. Kreeger

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Homework and Page References

• Page References- Page 7-11
• HW
• 6-11 on page 11
• Handout if not finished in class

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Table of Contents

1. Theory versus Law
2. The Mystery behind light
3. Doppler Effect
4. Red Shift
5. Big Bang Theory

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1. Theory vs. Law

1. Theory- Provides a general explanation for
   scientific observations that is consistent with
   known facts. (i.e. Einsteins theory of
   Relativity)
2. 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)

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2. Mystery of Light
Light
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2. Mystery of light

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

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Doppler Effect video
Doppler Effect
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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)

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4. Red Shift

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

Doppler Shift
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5. Big Bang Theory

1. Billions of years ago all matter and energy in
   universe was compressed into small volume
2. 17 billion years ago sudden event sent all matter
   and energy outward

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