How does the number of sunspots on the Sun vary with time?
A) The number of sunspots varies relatively regularly, with a period of about 11 years.
B) The number of sunspots varies irregularly, with no periodicity.
C) The number of sunspots increases and decreases with a precise period of 11.1 years.
D) The number of sunspots increases for about 11 years and then decreases again over the next 11 years.
Correct Answer:
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Q89: What is the lifetime of a typical
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A) the flow of
Q91: Astronomers have recently compared the relative abundances
Q92: What is the structure of a typical
Q93: Sunspots appear dark because they
A) are coronal
Q95: A typical sunspot group lasts
A) virtually forever.
B)
Q96: What is the average length of
Q97: The Stefan-Boltzmann law indicates that the energy
Q98: Sunspots are
A) cooler, darker regions on the
Q99: Other stars
A) have never been detected producing
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