Just as a Low-Mass Main Sequence Star Runs Out of Fuel

question 28

Multiple Choice

Just as a low-mass main sequence star runs out of fuel in its core, it actually becomesbrighter. How is this possible?

• A)Helium fusion gives more energy than hydrogen fusion does, based on masses.
• B)Its outer envelope is stripped away and we see the brilliant core.
• C)The core contracts, raising the temperature and increasing the size of the region of hydrogenshell-burning.
• D)It explodes.
• E)It immediately starts to fuse helium.

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Definitions:

Short Run

A period in which at least one factor of production is fixed and cannot be fully adjusted.

AVC Curve

The average variable cost curve, which shows how the unit variable cost of production changes with the level of output.

Profit-Maximizing

The process or strategy of adjusting production and pricing to achieve the highest possible profit margins for a business or firm.

Firm

A business organization that sells goods or services in order to make a profit.