Question

the luminosity of a galaxy with an active galactic nucleus (agn) is the luminosity of a normal galaxy with a similar mass and distance. dimmer than identical to higher than which statement best describes the cause of this relationship between the luminosity of an agn and the luminosity of a normal galaxy? the dimness of agns is due to their extreme distance from all other galaxies. an active galactic nucleus can emit hundreds of times more light than the otherwise normal galaxy that contains it, and is thus brighter than other normal galaxies. there are more stars in a galaxy with an active galactic nucleus. the active galactic nucleus acts as a lens and focuses all of the galaxys light into a beam, making the agn brighter than a normal galaxy.

Explanation:

Active galactic nuclei (AGNs) are powered by super - massive black holes at the centers of galaxies. Matter falling into these black holes releases an enormous amount of energy in the form of light. This makes AGNs much more luminous than normal galaxies with similar mass and distance. The first option about dimness due to distance is incorrect as we are comparing with similar - distance galaxies. Having more stars isn't the main reason for the high luminosity of AGNs. And AGNs don't act as a lens to focus light in the described way.

Answer:

The luminosity of a galaxy with an active galactic nucleus (AGN) is higher than the luminosity of a normal galaxy with a similar mass and distance.
An active galactic nucleus can emit hundreds of times more light than the otherwise normal galaxy that contains it, and is thus brighter than other normal galaxies.