The color ratio b_B/b_U has the following values for four stars. Which value indicates the coolest surface temperature?

Question

Quizplus · Accepted Answer

The color ratio is a measure of the difference in brightness (or intensity) between two different bands of wavelengths. A higher color ratio typically indicates a cooler surface temperature because cooler stars emit more of their light at longer wavelengths compared to hotter stars, which emit more at shorter wavelengths. Therefore, a color ratio of 4.0 suggests the coolest surface temperature among the given options.

The Color Ratio BB/bU Has the Following Values for Four

The Color Ratio B_B/b_U Has the Following Values for Four