space medium MCQ

Cepheid variables are important because their pulsation period correlates directly with _______.

  1. Surface temperature
  2. Luminosity
  3. Mass
  4. Age

Answer: Luminosity

Period-luminosity relation allows Cepheids to serve as standard candles for measuring galactic/extragalactic distances, foundational to Hubble's law.

Topic Astronomy - Stars
Exam Relevance SSC CGL, UPSC Prelims
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