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?
53. 'DTP' computer abbreviation usually means ?
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?
57. 'CD' computer abbreviation usually means ?
58. '.BAK' extension refers usually to what kind of file?
59. Where is the headquarters of Intel located?
60. Who co-created the UNIX operating system in 1969 with Dennis Ritchie?
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