Which of these lamps employs semi-conductor technology?
A) incandescent lamp
B) fluorescent lamp
C) CFL
D) LED
Correct Answer:
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Q60: Fraunhofer lines are apparent in
A)absorption spectra.
B)emission spectra.
C)Doppler
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A)monochromatic.
B)in phase.
C)coherent.
D)all of
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A)about
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