The star Regulus,in the constellation Leo,appears brighter through a blue filter than it does through a yellow filter.Suppose that a second star is found that has the same brightness as Regulus through the blue filter but is brighter than Regulus through the yellow filter.From this information,we can say conclusively that the second star has:
A) a higher temperature.
B) the same temperature but a higher luminosity.
C) the same temperature but a lower luminosity.
D) a lower temperature.

Question

Quizplus · Accepted Answer

The second star being brighter through the yellow filter suggests it emits more light at longer wavelengths, which is characteristic of a cooler star. Hence, it likely has a lower temperature than Regulus.

The Star Regulus,in the Constellation Leo,appears Brighter Through a Blue