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 time it takes light to travel the distance equivalent to "a shake of a lamb's tail", 30 cm at 300 000 km per second giving a nanosecond.
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