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For reproducing sound, a CD audio player uses a
1. Quartz crystal
2. Titanium needle
3. Barium ceramic
4. Laser beam

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Correct Answer - Option 4 : Laser beam

Explanation:

In compact disc digital data is scanned by laser beam for the reproduction of recorded sound.

 

  • The compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony to store and play digital audio recordings.
  • It was released in 1982 branded as Digital Audio Compact Disc. 
  • Compact Disc, also called a CD are small plastic discs which store and retrieve computer data or music using light. 
  • Compact Discs replaced floppy disks because they were faster and could hold more information

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