The graph shows how a star's orbital speed varies with time because of the gravitational tug of an orbiting planet. Based on these data, the planet's orbital period is about
A) 2 days.
B) 4 days.
C) 6 days.
D) 50 days.
A) 2 days.
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The geological feature in this photo is
A) an impact crater. B) a volcano. C) the unusual cloud formation in the background. D) a dried up lake basin.
What does the exclusion principle say?
A) No two particles of any type can ever occupy the same quantum state at the same time. B) If a particle has a precisely defined position it is excluded from having a precisely defined momentum. C) The laws of quantum mechanics are excluded from our common sense. D) Two fermions cannot occupy the same quantum state at the same time.
The temperature at the ________ of the Sun's chromosphere is higher than the temperature ________.
A. top; of the Sun's corona B. base; at the top of the chromosphere C. base; of the Sun's corona D. top; at the base of the chromosphere
The percentage (by number of atoms) of the Sun that is Hydrogen is about:
A) 91%. B) 71%. C) 27%. D) 9%. E) less than 1%.