Star C and Star D Have the Same Luminosity

question 31

Multiple Choice

Star C and star D have the same luminosity. Star C is twice as far away from Earth as star D. How do the brightnesses of stars C and D compare?

• A) Star C appears four times as bright as star D.
• B) Star C appears twice as bright as star D.
• C) Star D appears twice as bright as star C.
• D) Star D appears four times as bright as star C.
• E) Stars C and D appear equally bright.

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Definitions:

Actual Rate

The real interest rate or return on an investment, taking into account inflation.

Interest

The cost of borrowing money or the payment made to a lender by a borrower for the use of money, typically expressed as an annual percentage rate.

Credit Card

A payment card issued to users as a method of payment allowing the cardholder to pay for goods and services based on the holder's promise to pay for them at a later date.

Effective Annual Rate

The interest rate on a loan or financial product restated from the nominal rate as an annual rate, reflecting the effects of compounding.