What is the standard physical diameter of a Compact Disc ________?
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Answer: C. 12 cm
Explanation
Standard Compact Discs (CDs) are manufactured with a physical diameter of 12 centimeters. The correct dimension of twelve centimeters matches the international standard for audio and data CDs. Choosing this measurement accurately reflects the physical manufacturing specifications of compact discs. Compact discs were originally developed jointly by Philips and Sony in the early 1980s. The twelve centimeter size was chosen to allow enough storage capacity for a full symphony. Mini CDs exist with smaller diameters, but the standard format remains twelve centimeters.
Standardized disc sizes ensured that drives manufactured by different companies remained universally compatible. Physical dimensions allowed audio CDs to fit easily into home stereo systems and car players. Optical storage media revolutionized music distribution and computer software delivery during the 1990s. Ten centimeters is incorrect because standard full-sized audio and data compact discs are larger. Eleven centimeters does not match the standardized international physical dimensions for standard compact discs. None of these is wrong because twelve centimeters is explicitly listed as a valid option.
- Subject
- Computer Science
- Category
- Computer Science
- Topic
- —
- Difficulty
- medium
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