51.
Compact discs, (according to the original CD specifications) hold how many minutes of music?

52.
Once the active medium is excited, the first photons of light are produced by which physical process?

54.
The average power (in watts) used by a 20 to 25 inch home color television is...?

55.
What does AC and DC stand for in the electrical field?

56.
In which decade was the ARRL founded?

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