Multiple choice general knowledge science & technology

For reproducing sound, a CD (compact disc) audio player uses a

  1. Quartz crystal

  2. Titanium needle

  3. Laser beam

  4. Barium titanium ceramic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

CD players use laser beam technology to read digital data stored as microscopic pits on the disc surface. The laser reflects off these pits, and the reflection pattern is converted to audio signals. Quartz crystals are for timing, titanium needles are for vinyl records, and barium titanium ceramic is a piezoelectric material.

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