What shows directly that there is a nuclear force?
a. The fact that electrons congregate around the nucleus.
b. The fact that nuclei can lose nucleons.
c. The relatively large mass of protons and neutrons compared to the electrons.
d. The fact that electrons can change shells around the nucleus.
e. The fact that so many nuclei are stable and hold together despite the repulsion between their positive charges.
e
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The solar neutrino problem referred to the fact that, a couple decades ago, fewer neutrinos were being detected from the Sun than predicted by our theory of nuclear fusion. What was the solution to this problem?
A) We learned that the Sun is generating energy by means other than nuclear fusion. B) We learned that the Sun is generating much less energy than we thought it was. C) We learned that our detectors were mistaking neutrinos for the particles known as cosmic rays. D) We learned that our detectors were detecting only one of three different types of neutrinos that reach us from the Sun. E) We learned that our detectors were not functioning properly.
A satellite coasting at constant speed in a circular orbit
A) is beyond the pull of Earth's gravity B) is nevertheless accelerating. C) undergoes changes in its potential energy. D) none of the above
Which of the following statements correctly compares the terrestrial planets?
A. Earth is the only planet that has active plate tectonics and surface water. B. Venus has the densest atmosphere and the highest average temperature. C. Mercury is the planet with the thinnest atmosphere and the smallest size. D. All of these choices are correct.
What role did Princeton astronomers play in the research on the Big Bang?
What will be an ideal response?