The star's color index is a quick way of determining its:
A)density.
B)luminosity.
C)mass.
D)temperature.
E)composition.

Question

Quizplus · Accepted Answer

The star's color index is a measure of the difference in brightness between two different wavelengths, typically blue and yellow or blue and visual. This allows astronomers to determine the temperature of a star, as hotter stars emit more blue light and cooler stars emit more red light. Therefore, the star's color index is a quick way of determining its temperature, but not its density, luminosity, mass, or composition. The star's color index is a measure of its brightness in different colors or wavelengths. By comparing the brightness in different colors, we can determine the temperature of the star. As the temperature increases, the color of the star shifts from red to yellow to white to blue. Therefore, the star's color index can tell us its temperature, but not its density, luminosity, mass, or composition.

The Star's Color Index Is a Quick Way of Determining