A heterogeneous mixture is a combination of two of
more substances that
a) have a large amount of solute dissolved in a
given solvent.
b) are composed of atoms all having the same number
of protons in their nucleus.
c) appear nonuniform throughout any sample.
d) are combined chemically in a fixed ratio by mass.
•
•
c
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In the proton-proton chain
a. no neutrinos are produced. b. energy is released because a hydrogen nucleus has a greater mass than a helium nucleus. c. no photons are produced. d. carbon serves as a catalyst for the nuclear reaction. e. energy is produced in the form of gamma rays and the velocity of the created nuclei.
You are once again in a hot, dense place. You are surrounded by protons and neutrons, some rapidly fusing into helium. You notice that your surroundings are cooling (good, because it's really hot!) and rapidly dropping in density
Within about 3 minutes, the fusion reactions stop. Where are you? A) You are in the center of a star very much like our Sun. B) You are in the early universe during the era of nucleosynthesis. C) You are inside a nuclear power plant on Earth. D) You are in the center of a star much smaller than the Sun. E) You are in the center of a massive star near the end of its life.
If a guitar string has a fundamental frequency of 500 Hz, which one of the following frequencies can set the string into resonant vibration?
A) 1750 Hz B) 750 Hz C) 1500 Hz D) 250 Hz
The mass of an electron and its antiparticle, a positron, is 0.511 MeV/c2 . In order to produce an electron-positron pair, a gamma ray must have an energy larger than 1.022 MeV because __________
Fill in the blank(s) with correct word