As seen in 1987, when two silicon 28 nuclei fuse, or when seven alpha particles are added to a Si-28 nucleus, the initial result in either case is:
A) the shedding of bipolar planetary nebula shells.
B) a nova explosion.
C) iron 56.
D) cobalt 56.
E) nickel 56.
E
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The disk of the Milky Way is approximately 20,000 ly in diameter
a. True b. False Indicate whether the statement is true or false
Which of the following best describes the orbital resonance shared by Io, Europa, and Ganymede?
A) Io completes four orbits in the same time it takes Europa to complete two orbits and Ganymede to complete one orbit. B) Io, Europa, and Ganymede each have the same orbital period around Jupiter. C) Io, Europa, and Ganymede all show the same face to Jupiter at all times. D) Io, Europa, and Ganymede are always oriented in a straight line.
The process in which one plate slides under another is called subduction and is marked by deep ocean trenches
Indicate whether the statement is true or false
The two nuclei that can sustain a nuclear chain-reaction are
A) thorium and plutonium. B) 238U and plutonium. C) thorium and 235U. D) 235U and plutonium. E) Actually, there is only one nucleus that can sustain a nuclear chain-reaction.