Shake (time)
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A shake is an informal unit of time equal to 10 nanoseconds, or 10-8 seconds. It has applications in nuclear physics, helping to conveniently express the timing of various events in a nuclear explosion.
This is also applicable to circuits. Since signal progression in IC chips is very rapid, on the order of nanoseconds, a shake is good measure on how quickly a signal can progress through an IC.
Like many nuclear units, they derive from top secret operations during World War II. The word comes from the expression "two shakes of a lamb's tail", which indicates a very short time interval.
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