Why is it that processing speed is measured in hertz, and what is a 'good' processing speed?
Edit: What is it about processing speed that makes cycles per second an appropriate unit of measure. What cycle is being completed?
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Hertz is a measure of cyclic change. (It used to be "cycles per second" before they changed it to honor Heinrich Hertz.) In a CPU, Hertz describes clock rate, which is the frequency of a periodic signal that goes out to coordinate what the CPU is doing. The faster the clock, the more instructions the CPU can execute.
Note that clock speed is only one factor in processor speed. If two processors follow the same architecture, then the one with a higher clock speed will indeed be "faster". But some CPU architectures can burn through more instructions at a given clock speed than others. This has become less and less important as Intel-compatible CPUs drove other architectures off the market. However, the rise of mobile computing has brought the architecture issue forward, as device manufacturers choose the less powerful, but also less battery-draining, ARM architecture.