Older textbooks, and even some modern manufacturers, mean microfarads. That is remarkably incorrect but has been done and you can still find this usage.
The correct form of microfarad is µF but since older systems had a hard job inserting the Greek character mu (ALT 0181 in Windows) they used u instead. Thus you will see people saying things like 10,000uF. They could have said 10mF using the standard form, but everyone knows that mF is a bit ambiguous because of its dubious past!
I must say that I admire the way zeit and log dealt with this question. I found it utterly difficult to answer in a concise and still useful way. I even thought that it was some kind of a joke. But, given these answers, I realise that the question needed to be put and also to be answered. BTW Zeit; bist du deutsch?
One could the add, that frequency f can be converted to time of period ( t= 1/f )
and wavelength (Lambda = s/f) (sorry no Greek keyboard here
where s is the speed of light c (roughly 3e8 m/s) for electromagnetic waves in vacuum (or air).
If not dealing with electromagnetic waves (acoustics, seismic etc.) or if you are not transmitting throgh vacuum (cables for instance) you will need other values for s.
When going into the light end of the electromagnetic spectrum you usually use wavelength instead of frequency.
Many thanks to all who answered. I've printed your posts and now all I have to do is figure 'em out! I think I may need to rehash my maths from many moons ago!
