Multiple choice general knowledge science & technology

For reproducing sound, a CD audio player uses?

  1. Quartez Crystal

  2. Titanium Needle

  3. Laser Beam

  4. Berium Titenate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

CD audio players use laser beam technology to read digital data from the disc's microscopic pits and lands. A focused laser beam reflects off the CD surface, and the changes in reflection are converted into audio signals. Options A, B, and D describe technologies from vinyl records or other obsolete formats.

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