We determine the distance of a Cepheid by We determine the distance of a Cepheid by measuring its parallax. knowing that all Cepheids have about the same luminosity and then applying the inverse square law for light. determining its luminosity from the period-luminosity relation and then applying the inverse square law for light.
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Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!
cutt.ly/4zZs6GM