An Astronomer Observes Two Stars of the Same Surface Temperature

question 221

Multiple Choice

An astronomer observes two stars of the same surface temperature, but one has twice the diameter of the other. How many times larger is the luminosity from the larger star compared with that from the smaller star?

• A) 2
• B) 4
• C) 16
• D) They are the same.

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Definitions:

Planned Investment Spending

Expenditure on new physical capital intended by firms, which is part of aggregate spending in the economy.

Aggregate Demand Curve

A graphical representation showing the relationship between the total demand for goods and services in an economy at different price levels.

Short-Run Aggregate Supply

The supply of goods and services that firms in an economy plan on selling over a short period, taking into account the current price levels.

Demand for Money

The desire or need by individuals and businesses to hold money instead of other assets, due to its liquidity and ability to facilitate transactions.