Which statement best describes the solar neutrino problem?
A) Theoretical models predict that neutrinos should be produced in the Sun, but no neutrinos have ever been observed to be coming from the Sun.
B) Solar neutrinos were detected but in fewer numbers than predicted by theoretical models.
C) No one understands how it can be possible for neutrinos to be produced in the Sun.
D) Our current understanding of fusion in the Sun suggests that all neutrinos should be destroyed before they arrive at Earth, yet neutrinos are being detected.
E) The term solar neutrino problem refers to the fact that neutrinos are extremely difficult to detect.
B
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A third-quarter Moon is visible
a. near the eastern horizon just before sunrise. b. near the eastern horizon just after sunset. c. in the southern sky at sunrise. d. in the southern sky at sunset. e. from sunset until sunrise.
In the above H-R diagram sketch, which star is a white dwarf?
A. A B. B C. C D. D E. E
A spaceship encounters a single plane of charged particles, with the charge per unit area equal to ?. The electric field a short distance above the plane has magnitude ____ and is directed ____ to the plane.
A.
, parallelB.
, perpendicularC.
, parallelD.
, perpendicularE.
, parallelEarth's lower atmosphere is warm because of
A) incoming solar radiation. B) terrestrial radiation. C) cloud cover. D) outgoing short-wave radiation.