What Change Slowly Occurs During the Main- Sequence Lifetime of a Star

question 107

Multiple Choice

What change slowly occurs during the main- sequence lifetime of a star?

• A)Its core temperature slowly increases, increasing the fusion rate and hence the luminosity.
• B)As hydrogen is used up in the core, the fusion rate decreases and reduces the luminosity.
• C)It gathers more gas from interstellar space, increasing its mass and hence the luminosity.
• D)As the solar wind blows material into space, the decreasing mass reduces pressure in the core, which in turn reduces the fusion rate and the luminosity.

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Definitions:

Type II Error

An error that occurs when a statistical test fails to reject a false null hypothesis, indicating a missed opportunity to detect an actual effect or difference.

Type I Error

The incorrect rejection of a true null hypothesis, also known as a "false positive".

Effect Size

A quantitative measure of the magnitude of the difference between groups or the strength of the relationship between variables in a statistical analysis.

Null Hypothesis

A statement positing that there is no significant difference or effect, often the initial assumption in hypothesis testing.