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 0.53 ns to process a request. If the information has to be obtained from memory in 2 04 ns, what is the maximum distance the memory unit can be from the central processing unit?

Explanation / Answer

Time T = 2 t1 + t

2.04 = 2 t1 + 0.53

t1 = 0.755 ns

t1 = d / v, d = t1 * v = c t1 / n

= (3 * 108 * 0.755 * 10-9) / (3.5)

maximum distance d = 6.47 cm

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