According to the Big Bang theory, why do we live in a universe that is made of almost entirely of matter rather than antimatter?
A) During the first 0.001 second after the Big Bang, particles and antiparticles were made in almost but not perfectly equal numbers. Everything was annihilated except the slight excess of matter particles.
B) GUT theories predict that under the conditions that prevailed in the early universe, the normal laws of physics would have been suspended, so that only matter particles were created and no particles of antimatter.
C) The fact that we live in a universe made of matter is not surprising, because antimatter has never been shown to exist for real.
D) Einstein's famous equation E = mc2 tells us that energy can turn into matter but does not tell us that it can turn into antimatter.
A) During the first 0.001 second after the Big Bang, particles and antiparticles were made in almost but not perfectly equal numbers. Everything was annihilated except the slight excess of matter particles.
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The ___________of the product is the extent to which the product meets the performance criteria.
Fill in the blank(s) with the appropriate word(s).
Which clock measures the shorter time interval between the synchronization and comparison events (or do both measure the same time)?
A. Clock A B. Clock B C. Both D. Neither
Astronauts, in satellites orbiting Earth, feel weightless. Are they really weightless?
A) Yes, because the centrifugal force due to their circular motion balances the force of gravity. B) Yes, because they are not in Earth's gravitational field. C) Yes, because they are "falling" around Earth. D) No, because the gravitational force is pulling downward on them. E) No, because the centrifugal force is pulling outward on them.
The person who first explained the blackbody spectrum was __________
Fill in the blank(s) with correct word