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Published byMorgan Ford Modified over 5 years ago
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Before the bell rings, in your notes, write out the important aspects of a correctly designed experiment. Make sure to include a description of your variable and control.
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To understand the Big Bang…
We must first start understanding waves and the Doppler Effect!
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Lets First Experience the Doppler Effect!
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What causes this sound effect?
The Doppler Effect
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-Here we have a sound wave emitted from an object (car, siren, screaming 9th grader, etc.) Each red dot represents an air molecule
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Now lets consider the waves represented as circles…The waves are distributed evenly spaced in each direction (That means the same frequency!)
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What happens if we move the sound source?
Towards us at 50m/s…
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Moving towards us faster (100m/s)
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What is happening to the length between waves that are approaching us?
And faster yet! (300m/s) What is happening to the length between waves that are approaching us?
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Movement toward an object causes decrease in distance between the waves, which causes an increase in frequency. Higher Frequency = Higher Pitch (Shreekier!)
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What Happens if the source is moving away from us?
-Movement away from an object causes increase in distance between the waves, which causes a decrease in frequency. -Lower Frequency = Lower Pitch
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Lets sum this sound thing up!
With stationary sources, you can hear the same pitch in each direction If sound source is moving toward you, there is a higher frequency. If sound source is moving away, there is a lower frequency.
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How does this relate to the Big Bang?
Electromagnetic Spectrum and visible light
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Spectrum Named by Isaac Newton
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Types of spectra
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How Spectra are formed
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Spectra of elements Each spectrum is unique, like a fingerprint
Spectral Periodic Table Astronomers used spectroscopes to figure out what elements are in stars
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Spectra for some elements in the atmospheres of stars
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What elements are in this star?
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Answer The elements in the unknown star are: Hydrogen and Magnesium
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Now how can we relate the Doppler Effect to light, and ultimately the Big Bang?
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Lets look and see if we can figure out the following gases with our spectroscopes?
Helium Hydrogen Mercury Neon
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Doppler Effect on Light
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Stars and Galaxies
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The “Red Shift”
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What does it mean? Stars are moving away from us Universe is expanding
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What would cause the universe to be continuously expanding?
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