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36 Cards in this Set
- Front
- Back
#1 Force of nature
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Strong Nuclear Force-
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what does strong nucleus force do
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holds nucleus of atom together
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#2 force of nature
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Weak Nuclear Force-Distances less than the size of an atom’s nucleus
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what does weak nucleus force do
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responsible for 1)neutrinos and 2) atom’s radioactive decay.
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primevil fireball contained what
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alltypes of radiation
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Fireball radiation contained
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matter, photons, neutrinos, quarks
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when fireball expanded and cooled , what form of matter was there
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basics: neutrons, protons, electrons
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how hot was fireball
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10 ^ 32 K
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Strong Nuclear Force distances
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very short distances
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Weak Nuclear Force-Distances
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Distances less than the size of an atom’s nucleus
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#3 force of nature
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gravitational......gravity
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gravitational force/gravity
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Attraction of two bodies of mass to each other,
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Gravity diminishes
(2 variables) |
1) square of DISTANCE and 2) MASS of the objects
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#4 fORCE OF UNIVERSE
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Electromagnetic Force
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eLECTROMAGNETIC FORCE
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Magnetism and all other forms of radiation such as light, radio-waves, etc.
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Name the four forces of the universe
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1)Strong nuclear force
2)Weak Nuclear force 3)Gravitational 4)Electromagnetic |
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Grand Unified Theory
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elementary forces that unites the weak, strong, electromagnetic, and gravitational interactions into one field theory
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Planck Time
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The first 10-43 second after the explosion
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annihilation reaction
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a reaction in which a particle (matter)and its antiparticle (see antimatter) collide and disappear
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annihilation reaction: remember every action has equal and opposite reaction
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new energy created:
1) GAMMA ray 2)revert back to different matter/antimatter |
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after universe expands for 1 second , what is new temperature
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10^10 K
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after universe expands for 3 minutes, what is new temperature
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10 degrees K
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predominate materials, at least until star formation and fusion.
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Hydrogen, Helium, and some Lithium
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AS Universe continues to expand,
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1) density lessens (spreads out),
2)cooling continues |
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as UNIVERSE COOLS
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less energy.....more matter
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4 evidence of big bang
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1)1) Discovery by Penzias and Wilson
2) The Expanding Universe 3) finding center of Universe, 4) predicted gas levels. |
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who were Penzias and Wilson
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labworkers at Bell telephone
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what did Penzias and Wilson discover
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cosmic microwave background radiation.
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what is cosmic microwave background radiation.
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radiation left over from development of the universe
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proof of expanding universe
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wavelength of light rays: red-light waves shift-farther apart, blue ligth waves coming closer.
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what helped pinpoint center of Universe
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examining all those red and blue light ray shifts
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deuterium
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heavy hydrogen
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problem with big bang theory
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universe (stars/planets/galaxies) occured from asoultely nothing
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Steady State Hypothesis creators
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Hoyle, Bondi, Gold
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what is steady state hypothesis
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old and always existed....although the universe is expanding, it nevertheless does not change its appearance over time (the perfect cosmological principle); it has no beginning and no end.
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problem with steady state hypothesis
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Density must be constant in a steady state Universe and our Universe is expanding.
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