You have measured Doppler shifts to plot velocity curves for two otherwise identical stars. Star A has a period of 6 months and Star B has a period of 1 year. What can you say about the planets causing the motions of these stars?
A) Star A's planet is more massive than Star B's planet.
B) Star A's planet must orbit closer in than Star B's planet.
C) It is impossible to say anything about the planets orbiting these stars.
D) Star B must have a planet like Earth.
B) Star A's planet must orbit closer in than Star B's planet.
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Radioactive Decay: Given that the half-life for radium-226 is 1600 y, how long is the "quarter-life" (that is, the time for the radiation to decay to one-fourth of its initial level)?
Fill in the blank(s) with the appropriate word(s).
Describe the relation between Mercury's spin and orbit
What will be an ideal response?
The radioactivity due to carbon-14 measured in a piece of a wooden casket from an ancient burial site is found to produce 20 counts per minute from a given sample,
whereas the same amount of carbon from a piece of living wood produces 160 counts per minute. The half-life of carbon-14, a beta-minus emitter, is 5730 years. What would we calculate for the age of the artifact, assuming that the activity for living wood has remained constant over time? A) 5,700 years B) 11,500 years C) 14,800 years D) 17,200 years E) 23,000 years
Which of the following statements is true regarding shock waves?
A) They are predominantly transverse in nature. B) They can be produced by the birth of very hot stars. C) They are also called shear waves. D) They cannot be produced by supernova explosions.