Information is stored on an audio compact disc, CD-ROM, or DVD disc in a series of pits on the disc. These pits are scanned by a laser beam. An important limitation on the amount of information that can be stored on such a disc is the width of the laser beam. Explain why this should be, and explain how using a shorter-wavelength laser allows more information to be stored on a disc of the same size.
Information is stored on an audio compact disc, CD-ROM, or DVD disc in a series of pits on the disc. These pits are scanned by a laser beam. An important limitation on the amount of information that can be stored on such a disc is the width of the laser beam. Explain why this should be, and explain how using a shorter-wavelength laser allows more information to be stored on a disc of the same size.
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Information is stored on an audio compact disc, CD-ROM, or
DVD disc in a series of pits on the disc. These pits are scanned by a
laser beam. An important limitation on the amount of information that
can be stored on such a disc is the width of the laser beam. Explain why
this should be, and explain how using a shorter-wavelength laser allows
more information to be stored on a disc of the same size.
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