Question

What is a cepheid variable?

a star whose luminosity pulses at a variable rate
a star whose luminosity pulses at a regular rate
a star whose magnitude pulses at a variable rate
a star whose magnitude pulses at a regular rate

Answer 1

Cephhid variable is a star whose magnitude pulses at a regular rate

Answer 2

A star whose magnitude pulses at a regular rate is called Cepheid variable

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