The capture of too few solar neutrinos by Davis in the solar neutrino experiment
a. can be explained if the Sun is not undergoing thermonuclear fusion of hydrogen in its core.
b. indicates that the Sun's core is much hotter than expected.
c. indicates that the Sun's core is convective.
d. none of the others.
Question 2A(n) ____ orbit is one where the orbiting object is always above the same location on Earth's surface.
a. elliptical
b. geosynchronous
c. closed
d. hyperbolic
e. parabolic
Question 3In the proton-proton chain
a. no neutrinos are produced.
b. energy is released because a helium nucleus has a greater mass than a hydrogen 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.
Question 4The ____ produce(s) tides on the Earth.
a. Moon alone
b. Sun alone
c. Moon and Sun
Question 5Which of the following is suggested as the best explanation of the missing solar neutrinos?
a. The Sun is fusing helium but not hydrogen.
b. Nuclear reactions do not produce neutrinos as fast as theory predicts.
c. The Sun may contain matter we haven't yet identified.
d. Neutrinos may oscillate between three different flavors.
e. None of the others.
Question 6Tides occur because the gravitational force of the Moon on Earth ____ with increasing distance from the Moon.
a. stays constant
b. increases
c. decreases
Question 7The proton-proton chain needs high temperature because
a. of the ground state energy of the hydrogen atom.
b. of the presence of helium atoms.
c. the protons must overcome the Coulomb barrier.
d. of the need for low density.
e. the neutrinos carry more energy away than the reaction produces.
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