Which of the following is NOT a component of a CPU?
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A.
Hard Disk
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B.
Arithmetic Logic Unit (ALU)
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C.
Control Unit (CU)
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D.
Cache Memory
Correct Answer:
A. Hard Disk
Explanation:
The absolute refractive index (n) of a medium is defined as the ratio of the speed of light in a vacuum (c) to its speed within that specific medium (v), expressed by the formula n = c/v. If this value is less than 1, it implies that light is traveling faster in that medium than it does in a vacuum. Under standard conditions, the refractive index is typically 1 or higher because the speed of light in a vacuum is considered the universal speed limit for matter and information. However, in certain specialized contexts like plasmas or X-ray optics, a refractive index below unity can occur; this refers specifically to the phase velocity of the wave exceeding the speed of light in a vacuum, which does not violate the laws of physics as it does not involve the transfer of information faster than c.
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