An advanced computer sends information to its various parts via infrared light p

Question

An advanced computer sends information to its various parts via infrared light pulses traveling through silicon fibers (n= 3.50). To acquire data from memory, the central processing unit sends a light-pulse request to the memory unit. The memory unit processes the request, then sends a data pulse back to the central processing unit. The memory unit takes 0.50ns to process a request. If the information has to be obtained from memory in 2.00 ns, what is the maximum distance the memory unit can be from the central processing unit?

Explanation / Answer

Using that, the roundtrip must be limited to under 1.5nS (since processing takes 0.5), so the answer must be under 0.75 feet or 9 inches.

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