How did measurements of neutrinos from the Sun pose a problem for modern astronomy and how was it resolved?
What will be an ideal response?
Measurements showed that only one-third of the neutrinos expected to come from the Sun arrived on Earth. Scientists were eventually able to build better detectors that showed neutrinos change back and forth among three different "flavors".
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Describe the various ways that stellar masses can be determined in binary star systems
What will be an ideal response?
A hoop, a solid cylinder, and a solid sphere all have the same mass m and the same radius R. Each is mounted to oscillate about an axis a distance 0.5R from the center. The axis is perpendicular to the circular plane of the hoop and the cylinder and to an equatorial plane of the sphere as shown below. Which is the correct ranking in order of increasing angular frequency
??
?
?
a.
hoop, cylinder, sphere
b.
cylinder, sphere, hoop
c.
sphere, cylinder, hoop
d.
hoop, sphere, cylinder
e.
sphere, hoop, cylinder
When a light ray travels between any two points, the path it takes is the one that (Hint: Eliminate answers you know are wrong.)
a. covers the greatest distance. b. follows the greatest index of refraction. c. avoids travel in more than one medium. d. is the mean between the longest and the shortest paths. e. takes the least time.
The Big Rip refers to the
A) accelerating influence of dark energy, causing all matter to become completely ripped apart. B) phenomenon of dark energy causing the universe to rip into multiple spacetimes. C) possibility that galactic centers may suddenly implode causing galactic disintegration. D) phenomenon of dark energy decelerating, causing all matter to disintegrate.