Which term describes the rate of energy output from a light source? a. absolute magnitude b. apparent magnitude c. luminosity d. temperature

The term ‘luminosity’ describes the rate of energy output from a light source.

 Option C

Explanation:

Luminosity defined as the total energy emitted from a light source per second i.e. the rate of energy emitted from a light source. The source can be either as big as a star or as small as a lamp.

Luminosity is measured in terms of Joule per second according to its definition. This is also called Watt (Joule/sec).