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 annihilated except the very 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) 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.
D) The fact that we live in a universe made of matter is not surprising, because antimatter has never been shown to exist for real.
A
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Indicate whether the statement is true or false
The intricate patterns visible in an X-ray image of the Sun generally show
A) helioseismological fluctuations. B) a bubbling pattern on the photosphere. C) extremely hot plasma flowing along magnetic field lines. D) structure within sunspots.
An electric car is designed to run off a bank of 15-V batteries with total energy storage of 2.1 × 10^7 J. If the electric motor draws 4 200 W in moving the car at a steady speed of 14 m/s, how far will the car go before it is "out of juice?"
a. 35 km b. 70 km c. 140 km d. 110 km e. 18 km
Which of the following are advantages offered by the thorium nuclear reactor?
A) operates at relatively low temperatures B) produces isotopes of short radioactive half-lives C) difficult to use for bomb making D) All of the above.