How Does the Number of Sunspots on the Sun Vary

question 140

Multiple Choice

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.

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