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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Definitions:

Larynx

The voice box; a structure in the throat containing the vocal cords, responsible for producing sound and protecting the airway during swallowing.

Cardiac Sphincter

A muscular valve located between the esophagus and the stomach, preventing acid reflux from the stomach back into the esophagus.

Pyloric Sphincter

Thickening of the circular layer of the gastric musculature encircling the junction between the stomach and duodenum; also called pylorus.

Hydrochloric Acid

A strong acid secreted by the stomach lining that helps in digestion by breaking down food and killing bacteria.