Observationally,the Biggest Difference Between Quasars and Other Active Galaxies Such

question 10

Multiple Choice

Observationally,the biggest difference between quasars and other active galaxies such as Seyfert and radio galaxies appears to be that (see Table 13-2,Comins,Discovering the Essential Universe,6th ed.) :

• A) quasars appear to be located inside elliptical galaxies, whereas Seyfert and radio galaxies are spirals.
• B) Seyfert and radio galaxies do not have the bright, starlike nuclei of quasars.
• C) the brightness of Seyfert and radio galaxies does not vary with time.
• D) Seyfert and radio galaxies are less powerful energy emitters than quasars.

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Definitions:

Opportunity Cost

The cost of forgoing the next best alternative when making a decision, a fundamental concept in economics that emphasizes the potential benefits that are lost when choosing one option over another.

Comparative Advantage

The ability of a party to produce a particular good or service at a lower marginal and opportunity cost over another.

Specialize

The process of focusing effort and resources on a particular area of expertise or production to increase efficiency and output.

Production Possibility Frontiers

A curve depicting all maximum output possibilities for two goods, given a set of inputs and technology, illustrating the trade-offs and opportunity costs.