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Question related to Moore's Law

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sotomie

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I need to solve this question ,I am not sure if i'm solving it right
q:In 1972, Intel 8008 microprocessor had 3500 transistors manufactured in 10 µm process while in 2006, Intel Itanium 2 processor contained 1.72 billion transistors using 90 nm process. Based upon these two data points only and assuming a constant doubling of transistor count in equal intervals of time, calculate the time interval it took to achieve doubling of transistor between the period 1971-2006.

My answer is 3.95*10^-8 years,which seems a bit weird!Any idea how this will be solved in accordance with Mooore's Law?
Thanks in advance.
 

1.72 billion / 3500 = 491 thousand.
2^19 = 524 thousand
So the number of transistors has doubled nearly 19 times.
35 years / 19 = 1.8 years

BTW, is it 1971 or 1972? You mentioned both dates.
 
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