What is meant by frequency and why is it more fundamental than time?

*The only mathematics you need to begin with is the ability to count and to perform the basic arithmetical operations of multiply and divide.*

The unit of frequency is the hertz. Your heart rate is near to one hertz.

Let’s start with the idea of **frequency**. (Rate means the same thing.) Frequency is a key concept and this book is built on it.

Take your pulse. Its frequency is about one hertz. This book is all about things that happen at a much greater rate, at about one terahertz. I will define a terahertz a little later, but for now it is enough to know that it is a rate. Let’s begin with something closer to hand, the rate at which your ...

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