Suppose that you measure the parallax angle for a particular star to be 0.5 arcseconds. What is the distance to this star?
A) 0.5 light-year
B) 0.5 parsec, which is about 1.63 light-years
C) 5 light-years
D) 5 parsecs, which is about 16.3 light-years
E) 2 parsecs, which is about 6.52 light-years
E) 2 parsecs, which is about 6.52 light-years
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Why does the Sun's convection zone exist?
A. The rate of energy transport is too low for radiation to be efficient. B. There is too much energy passing through the region to transport by radiation. C. It serves as a way to replenish the core with hydrogen. D. The sun does not have a convection zone.
The primary coil of an ideal transformer has 600 turns and its secondary coil has 150 turns. If the current in the primary coil is 2 A, what is the current in its secondary coil?
A) 8 A B) 2 A C) 1/2 A D) 4 A E) 1/4 A
The decay of a sample of radioactive atoms is studied by observers moving in different ways. One moves at 0.8c, another at 0.5c, another at 0.25c, and one at speed zero with respect to the sample. The one with a speed of ________ will measure the shortest half-life.
Fill in the blank(s) with the appropriate word(s).
Nuclear Binding Energy: A fusion reaction releases energy because the binding energy of the resulting nucleus
A. is greater than the binding energy of the original nuclei. B. is equal to the binding energy of the original nuclei. C. is less than the binding energy of the original nuclei. D. is released in the process. E. is absorbed in the process.