A star in the instability strip of the H-R diagram would
A) explode as a Type I supernova.
B) vary in both temperature and radius.
C) vary in temperature and radius, but not in brightness.
D) vary in brightness with an irregular pattern.
E) vary in temperature and brightness, but not in radius.
B
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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.
If a person weighs 150 lb on Earth, what will the person weigh on the Moon?
a. 25 lb b. 900 lb c. 150 lb d. 75 lb e. 300 lb
An object 20-cm high is placed 50.0 cm in front of a lens whose focal length is 5.00 cm. Where will the image be located (in cm)?
a. 5.13 b. 5.56 c. 5.72 d. 5.93 e. 4.55
How many structural isomers are shown here?
A) one B) two C) three D) four