What Do We Mean by the Main- Sequence Turnoff Point

question 71

Multiple Choice

What do we mean by the main- sequence turnoff point of a star cluster, and what does it tell us?

• A)It is the spectral type of the hottest main- sequence star in a star cluster, and it tells us the cluster's age.
• B)It is the point in a star cluster beyond which main sequence stars are not found, and it tells us the cluster's distance.
• C)It is the mass of the most massive star in the star cluster, and it tells us the cluster's size.
• D)It is the luminosity class of the largest star in a star cluster, and it tells us the cluster's age.

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Definitions:

Psychological Disturbances

Disorders or conditions that affect the mind, where patterns of thinking, behavior, or emotions are disrupted, leading to distress and/or impaired functioning.

Pulmonary Functioning

The ability of the lungs to take in oxygen and expel carbon dioxide, often assessed with breathing tests.

Antecedent Factor

A variable or condition that precedes and may cause or contribute to the outcome of interest.

Parasympathetic Branch

Part of the autonomic nervous system responsible for conserving energy and slowing down the body's response after a state of arousal.