What is the solar neutrino problem?
What will be an ideal response?
Solar neutrinos coming from the Sun have been detected, but early detectors found them in fewer numbers than predicted by theoretical models. This means either that our models of the Sun were not completely correct or that we didn't understand neutrinos as well as we thought we did. We can measure the luminosity that the Sun is producing and therefore determine how much fusion must be going on in its core. The rate of fusion then determines how many neutrinos should be produced by the Sun, and theories estimate how many of these should be detected here on Earth. It turns out that neutrinos can change type when they interact with matter. Newer detectors can find all three types of neutrinos, and now the total number of neutrinos detected matches predictions.
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At the end of 1/2 second an apple freely falling from rest has a speed of
A) 1 m/s. B) 5 m/s. C) 10 m/s. D) more than 10 m/s.
A dam is thicker at the bottom than at the top because
A) water is denser at deeper levels. B) water pressure is greater at deeper levels. C) water is cooler at deeper levels. D) dams look better. E) none of the above
What measurements are needed to determine the orbital motion of a spectroscopic binary star?
What will be an ideal response?
What are the typical features seen in quasar absorption lines of intergalactic clouds?
A) The hydrogen line is wider and lines from heavy elements are weaker at higher redshifts. B) The hydrogen line is narrower and lines from heavy elements are weaker at higher redshifts. C) The hydrogen line is wider and lines from heavy elements are stronger at higher redshifts. D) The hydrogen line is narrower and lines from heavy elements are stronger at higher redshifts. E) A few weak absorption lines are always seen at higher redshift than the quasar.