The 21-Cm Line Is One of the Most Important Wavelengths

question 99

Multiple Choice

The 21-cm line is one of the most important wavelengths in radio astronomy. The fact that it is a relatively long wavelength is important because long wavelengths

• A) are more likely to interact with clouds of gas and dust.
• B) are more likely to pass through clouds of gas and dust.
• C) carry more energy than short wavelengths of the same energy.
• D) can be detected with greater resolution than can short wavelengths.

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Definitions:

Equation of Exchange

The equation of exchange is an economic equation that relates the quantity of money in an economy to the nominal value of economic transactions, typically represented as MV = PQ, where M is the money supply, V is the velocity of money, P is the price level, and Q is the quantity of goods and services.

Real GDP

An indicator of a country's economic productivity, corrected for fluctuations in price levels, showcasing the genuine value of all produced goods and services.

Aggregate Demand

Refers to the total amount of goods and services demanded in the economy at a given overall price level and in a given time period.

Short-Run Aggregate Supply Curve

Represents the relationship between the total supply of goods and services produced by an economy and the price level for those goods and services in the short run.