What physical characteristics change in the Sun over the 11-year solar cycle? To what is this cycle apparently related?
What will be an ideal response?
The number of sunspots changes over an 11-year cycle. At their peak, there may be hundreds of sunspots seen at any one time; at their minimum, virtually none may be seen. The sunspot cycle appears to be related to the solar cycle which is the reversal of the Sun's magnetic field each 11 years and back again in another 11 years for a total of 22 years.
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You live at a latitude of 39° S. What is the angle between the southern horizon and the south celestial pole?
a. 45° b. 23.4° c. 39° d. 51° e. The answer depends on the day of the year.
Radioactivity Basics: A radioactive isotope of atomic number Z emits an alpha particle, and the daughter nucleus then emits a beta-minus particle. What is the atomic number of the resulting nucleus?
A. Z - 1 B. Z + 1 C. Z - 2 D. Z - 3
Study this graph, focusing on the red curve and reddish horizontal swath. Which statement correctly interprets what the graph shows?
A) The measured abundance of deuterium agrees with the theoretically predicted abundance only if we make the prediction with a model of the universe in which ordinary matter makes up about 5% of the critical density. B) The abundance of deuterium in the universe has rapidly decreased with time. C) The actual abundance of deuterium in the universe has never changed, but the predicted abundance has decreased with time. D) The abundance of deuterium in the universe is high in galaxies near the Milky Way but much lower in galaxies that are much farther away.
Which system has the smallest total mass?
A. System A B. System B C. System C D. Systems A and B (which have equal total masses) E. Systems A and C (which have equal total masses) F. Systems B and C (which have equal total masses) T. All three systems have the same total mass.