Observations show that elements with atomic mass numbers divisible by 4 (such as oxygen-16, neon-20, and magnesium-24) tend to be more abundant in the universe than elements with atomic mass numbers in between. Why do we think this is the case?
A) At the end of a high-mass star's life, it produces new elements through a series of helium capture reactions.
B) The apparent pattern is thought to be a random coincidence.
C) Elements with atomic mass numbers divisible by 4 tend to be more stable than elements in between.
D) This pattern in elemental abundances was apparently determined during the first few minutes after the Big Bang.
A) At the end of a high-mass star's life, it produces new elements through a series of helium capture reactions.
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Which of the following results shows the validity of the relativistic effect of time dilation?
A) the detection of gravity waves B) bending of light near the Sun C) the decay of muons D) red shift in distant galaxies E) blue shift in distant galaxies
A player catches a ball. Consider the action force to be the ball against the player's glove. The reaction is the
A) player's grip on the glove. B) force of the glove on the ball. C) friction of the ground against the player's shoes. D) muscular effort in the player's arms. E) none of the above
Six months of darkness at the North Pole begins when the Sun is at the
a. winter solstice. b. summer solstice. c. autumnal equinox. d. vernal equinox.
Which of the terrestrial planets has rings?
a. Mercury b. Venus c. Mars d. None of the terrestrial planets has rings.