A Classical Cepheid Variable Star in a Distant Galaxy Has

question 117

Multiple Choice

A classical Cepheid variable star in a distant galaxy has an apparent magnitude of +20.3. By measuring its period and using the period-luminosity relation, its absolute magnitude is -6.0. Assuming that there is no interstellar absorption, what is the distance to the galaxy in parsecs?

• A) 3.6 * 10⁴ pc
• B) 7.2 * 10³ pc
• C) 1.1 * 10⁵ pc
• D) 1.8 * 10⁶ pc

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