As a star's evolution approaches the Type II supernova, we find:
A) the heavier the element, the less time it takes to make it.
B) the heavier the element, the higher the temperature to fuse it.
C) helium to carbon fusion takes at least 100 million K to start.
D) photodisintegration of iron nuclei begins at 10 billion K to ignite the supernova.
E) All of the above are correct.
E
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An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration is
A) 0 m/s2. B) 5 m/s2. C) 8 m/s2. D) 24 m/s2.
Dust is an important part of the nebular theory of solar system formation because dust is needed to explain:
A) how the inner planets came to be rocky bodies. B) how the outer planets came to be gaseous bodies. C) how the initial cloud cooled enough to collapse. D) how the initial cloud heated as it contracted. E) why the icy bodies are located so far from the Sun.
In radioactive decay, the original nucleus before decay is referred to as the
A) daughter isotope B) parent isotope C) mother-in-law isotope D) progenitor isotope
The average temperature of the typical dark dust cloud is about:
A) 0 K. B) 2.73 K. C) 100 K. D) 3,000 K. E) 6,000 K.