Two Stars Are Found to Have the Same Luminosity

question 102

Multiple Choice

Two stars are found to have the same luminosity. However, one star has twice the surface temperature of the other. From this information, what can one determine about their radii?

• A) The hotter star has half the radius of the cooler star.
• B) The cooler star has half the radius of the hotter star.
• C) The hotter star has a quarter the radius of the cooler star.
• D) Nothing can be determined about the radii from this information.

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Definitions:

Frictional Unemployment

Short-term unemployment that arises from the process of workers moving between jobs or into the workforce.

Structural Unemployment

A form of unemployment caused by a mismatch between the skills that workers in the economy can offer and the skills demanded by employers.

Structural Unemployment

Refers to unemployment caused by structural changes in the economy such as technological advances, which create mismatches between the skills workers have and the skills needed for available jobs.

Demand Shifts

Demand shifts occur when the overall demand for a product or service increases or decreases due to changes in consumer preferences, income levels, prices of related goods, and other factors.