For What Type of Object Is the Period-Luminosity Relation Used

question 29

Multiple Choice

For what type of object is the period-luminosity relation used for determining distances?

• A) RR Lyrae variables
• B) T Tauri variables
• C) Cepheids
• D) Cataclysmic variables
• E) Planetary nebulae

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Definitions:

OID

Original Issue Discount; it refers to the difference between the original issue price of a bond and its maturity value, treated as interest for tax purposes.

Series I Savings Bonds

A type of U.S. savings bond designed to protect the value of your cash from inflation.

Qualified Higher Education Expenses

Expenses required for enrollment or attendance at an eligible educational institution, including tuition, fees, books, supplies, and equipment.

AGI

This refers to the measure of income calculated from your gross income and used to determine how much of your income is taxable.