What Do the Broad Emission Lines in Quasar Spectra Tell

question 9

Multiple Choice

What do the broad emission lines in quasar spectra tell astronomers about these objects?

• A) They are very far away.
• B) They are moving away from us.
• C) They have rapid internal motions.
• D) They are very dense.

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Definitions:

Synchronous Speed

The rotation speed at which the magnetic field in the stator rotates in synchronous machines, typically equal to the AC supply frequency divided by the number of pole pairs.

Synchronous Motor

An AC motor that operates at a constant speed, set by the power supply frequency, and whose rotor is synchronized with the magnetic field of the stator.

Amortisseur Winding

A squirrel-cage winding on the rotor of a synchronous motor used for starting purposes only.

Phase Rotation Meter

A meter used to determine the rotation of a motor.