We Can Identify Only a Small Fraction of All the Pulsars

question 29

Multiple Choice

We can identify only a small fraction of all the pulsars that exist in our galaxy because

• A) gas and dust efficiently block radio photons.
• B) few swing their beam of synchrotron emission in our direction.
• C) most have evolved to become black holes,which emit no light.
• D) massive stars are very rare.

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Definitions:

Power Cords

Electrical cables used to connect appliances and electronic devices to the main electricity supply in order to power them.

Fifth Worker

An example used in economics to illustrate the principle of diminishing returns, where the addition of a fifth worker may lead to a lesser increment in output than the fourth.

Marginal Product

The additional output that can be produced by adding one more unit of a specific input, keeping all others constant.

Bushel of Wheat

A unit of measure for volumes of wheat, commonly used in agriculture, equivalent to approximately 60 pounds in the United States.