Describe the construction of a compact disc and draw its cross - sectional diagram . Name five types of compact disc s
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Answer:A compact disc is a portable storage medium that can be used to record, store and play back audio, video and other data in digital form.
A standard compact disc measures 4.7 inches, or 120 millimeters (mm), across, is 1.2 mm thick, weighs between 15 grams and 20 grams, and has a capacity of 80 minutes of audio, or 650 megabytes (MB) to 700 MB of data.
A CD works by focusing a 780 nanometer wavelength semiconductor laser onto a single track of the disc. As the disc rotates, the laser beam measures differences in the way light is reflected off the polycarbonate layer on the bottom of the disc, converting it to sound.
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