Variations in the Luminosity of Quasars Over the Span of a Few

question 62

Multiple Choice

Variations in the luminosity of quasars over the span of a few hours are an indication

• A) of the rapid rotation of the sources.
• B) that these objects are actually binary systems in which one sees mutual eclipses.
• C) of the relatively small size of the emitting regions.
• D) of obscuring gas and dust clouds moving in front of them from Earth's point of view.

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Definitions:

Total Variable Costs

The sum of expenses that vary directly with the level of production or output, including costs for materials and labor.

Output

The amount of goods or services produced by a business, industry, or economy.

Supply Curve

A graphical representation showing the relationship between the price of a good and the amount of it that producers are willing to supply at each price level.

Total Variable Costs

The sum of all costs that vary directly with the level of production or output in the short term.