Which axiom of set theory is used to define the constructible universe L? A. Axiom of Infinity B. Axiom of Power Set C. Axiom of Choice D. Axiom of Constructibility
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- 1. Which of the following theories is probabilistic? a. Newton's Law of Gravity. b. Kepler's Laws of Planetary Motion. c. Quantum Mechanics. d. General Relativity.5. Cesar reads about the big bang theory, which explains that the universe expanded as theresult of an explosion. He wants to evaluate whether this theory is a good one. Whichstatement is a characteristic of a good theory? A. It is the idea of only one scientist.B. It does not change as time passes.C. It is not supported by scientific evidence.D. It changes with new observations made by astronomers.Which is a scientific hypothesis? Select one: a.atoms are the smallest matter particles b.the universe is one of many universes c.Einstein is the top physicist of our century d.all of these answers.
- 20. Gravitational lensing can be used to detect which component of the Universe? a. Dark Matter. b. Photons. c. Dark Energy. d. Electrons.What possible evidence do we have for the existence of "dark energy"? a. It blocks our view of distant parts of the universe b. The universe contains more light than has ever been emitted by stars. c. Expansion seems to be accelerating d. We see the cosmic background radiation in all directions e. All of the above4. Which of the following constituents of the Universe is present in the highest fraction in terms of its contribution to the total energy of the Universe? a. Dark Matter. b. Dark Energy. c. Light. d. Normal (baryonic) matter.
- 1. Which of these is true about the Big Bang model? a. The singularity is an established, well-defined part of the model. b. Cosmic expansion stopped at some point in time. c. Part of its proof is the amounts of H and He we have in the universe today. d. The Big Bang was a big explosion that threw matter into many different directionsThe mass density of our universe is measured to be about 10-29 kg/m3. If an arbitrary point is chosen as the center, how large is the radius of a spherical surface centered at the point so that the mass enclosed in the surface will become a blackhole observed by someone outside the surface? A. 4.2 trillion light years B. 420 billion light years C. 42 billion light years D. 4.2 billion light years Is the answer D? Thanks!21. Which of the following represents the notion that our observable Universe may be a part of a much larger whole? a. Big Bang Nucleosynthesis. b. Solar System. c. Galaxy. d. Multiverse.
- If the universe is closed and finite, then a. the universe has a center and an edge. b. the universe will expand forever. c. the final fate of the universe will be very cold and of extremely low density. d. the space-time of the universe is negatively curved. e. none of the above are true.Which of these forces is NOT unified with the others in a Grand Unified Theory? a. gravitational force b. strong force c. electromagnetic force d. weak force e. They have all been shown to be unified.The assumption of isotropy states that a. the universe looks the same at all epochs. b. the universe looks the same from all locations over sufficiently great distances. c. the universe looks the same in all directions over sufficiently great distances. d. all of the above are true. e. none of the above are true.