When a Low Mass Star First Runs Short of Hydrogen

question 93

Multiple Choice

When a low mass star first runs short of hydrogen in its core, it becomes brighter because

• A) its outer, cooler layers are shed, and we see the brighter central core.
• B) the helium flash increases the size of the star immensely.
• C) the core contracts, raising the temperature and extending the hydrogen burning shell outward.
• D) it explodes as a nova.
• E) helium fusion gives off more energy than does hydrogen.

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Definitions:

Cognitive Therapy

A form of psychotherapy that emphasizes the importance of thought patterns in contributing to and maintaining psychological disorders.

Behavior Therapy

A therapeutic approach that focuses on changing negative behaviors through various behavior modification techniques.

Attention Bias to Threat

The tendency to pay more attention to threatening stimuli than to neutral stimuli, often observed in anxiety disorders.

Beck's Cognitive Therapy

Beck's Cognitive Therapy is a form of psychotherapy that treats problems and boosts happiness by modifying dysfunctional emotions, behaviors, and thoughts.