The half-life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is 105 years
a. True
b. False
Indicate whether the statement is true or false
False
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Which of the following statements is generally true for stars in the halo?
A) Halo stars all orbit the center of the galaxy in approximately the same plane. B) Halo stars always remain in the halo, never passing through the disk of the galaxy. C) All halo stars will end their main-sequence lives within the next 100 million years. D) Halo stars have a much smaller proportion of elements besides hydrogen and helium than our Sun. E) Halo stars come in a wide variety of ages.
A rocky body between the orbits of Mars and Jupiter is a(n)
A) meteorite. B) comet. C) asteroid. D) meteor. E) meteoroid.
Process of Science: Describe a hypothetical observation of a white dwarf that, if made and verified by others, would dramatically challenge our physical understanding of them
What will be an ideal response?
The overall result of the proton-proton chain is ________
A) 6 H becomes 1 He + energy B) p + p becomes 2H + energy C) 4 H becomes 1 He + energy D) individual protons are joined into long chains of protons