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 processor 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 0.50 ns 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

so if 0.5ns are processing that leaves 1.5 ns to go both direction

so 0.75 ns for one direction

distance = v t = 3E8*0.75E-9=0.225 m

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