There are two distinct period-luminosity relations,Type I and Type II.
A) Type I is metal rich and more luminous.
B) Type II is metal rich and more luminous.
C) Type I is metal poor and more luminous.
D) Type II is metal poor and more luminous.

Question

Quizplus · Accepted Answer

Type I Cepheids are generally more luminous and have a higher metallicity compared to Type II Cepheids, which are older, less luminous, and have a lower metallicity.

There Are Two Distinct Period-Luminosity Relations,Type I and Type II