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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Background Information

This term describes the essential context or previous data about a topic, necessary for understanding the current situation or analysis.

Indirect Strategy

A communication approach that presents the main point or conclusion after the provision of supportive evidence or arguments.

Sensitive Messages

Communications that require careful handling due to the potential for impacting the recipient emotionally or generating controversy.