For what type of object is the period-luminosity relation used for determining distances?
A)RR Lyrae variables
B)T Tauri variables
C)Cepheids
D)cataclysmic variables
E)planetary nebulae

Question

Quizplus · Accepted Answer

The period-luminosity relation is used to determine the distances to Cepheid variable stars. This is because the period of variation in brightness of a Cepheid is directly related to its intrinsic luminosity, making it a useful standard candle for measuring distances in the universe. The period-luminosity relation is most commonly used for determining distances to Cepheid variables. These stars have a regular pulsation period that is directly related to their luminosity, making them useful standard candles for measuring distances in the universe.

For What Type of Object Is the Period-Luminosity Relation Used