Question

question 9 (1 point) the hertzsprung - russell diagram shows the relationship between a stars temperature and luminosity (absolute brightness). it is often called the h - r diagram. the h - r diagram can be used to classify stars and to learn about their life cycle. figure 1 shows the h - r diagram. how is it possible for red giant stars to have greater absolute brightness than white dwarf stars? a they have a higher temperature b they have a larger diameter c they are closer to earth d they are younger than the sun

Explanation:

Luminosity of a star depends on its surface - area and temperature. Red - Giants are large in size (bigger diameter) compared to White - Dwarfs. Even though White - Dwarfs are hotter, the large surface - area of Red - Giants allows them to emit more total energy, resulting in greater absolute brightness.

Answer:

B. They have a larger diameter