v for frequency?

[Commander Kinsey]

Since when did we start using v for frequency? v is velocity, f is frequency, lambda is wavelength. Using v for frequency is pure insanity.

[Fredxx]

It's only insane for those ignorant of the fact in this case v is the Greek letter nu and has no relation ship to your v for velocity. The capital is N.

Sheesh anyone with an IQ over 90 would know that.

[Phil Hobbs]

Any time you folks feel like taking this pissing contest back to your own shores, go with our blessing. ;)

Cheers

Phil Hobbs

[The Natural Philosopher]

Any time you feel like commenting, dont. Both of these areseholes are in my kill fille

[Phil Hobbs]

Well, if you put me there too, you'll be just that much safer. Can't be too careful.

[John Larkin]

Killfiles get confusing when you see followups to posts that you can't see. It's easier to just ignore the known jerks.

[Phil Hobbs]

I use Thunderbird filters, set to 'mark post as read" or "ignore subthread", depending on the case.

Cheers

Phil Hobbs

[jim.gm4dhj]

[The Natural Philosopher]

So far you haven't displayed the emotional pot stirring, bigotry and the total lack of intelligence of the denizens of my kill file.

[The Natural Philosopher]

No can do. 70% of uk.d-i-y is total drivel from about 6 usual suspects. I dont want to waste what is left of my life reading it

[Phil Hobbs]

I'll obviously have to up my game. ;)

Cheers

Phil Hobbs

[Fredxx]

Excellent, then that means you don't see the numerous corrections I make to your posts.

[Fredxx]

One of which is you.

When you stop spouting lies on on uk.d-i-y I'll stop telling the truth you prefer not to hear, for which you have no response.

[Mark Lloyd]

They had to name it after somebody, rather than using something actually meaningful.

Like Celsius instead of centigrade.

[NY]

Are you thinking of lamba λ (like an inverted v with a tail on one leg) which is wavelength (c/f) where c is speed of light and f is frequency.

[NY]

(I assume "tan" is a typo for "than", rather than the trig function!)

I can see an advantage in abbreviating "c/s" to "Hz", especially when it is spoken aloud - "482 mega hertz" is shorter than "482 mega cycles per second".

Are there any other SI units which are abbreviations for the reciprocal of another SI unit? I suppose there's mho for conductance which is 1/R (in ohms) and written as an upside-down omega. But that's not as widely used.

The notation that always jars with me is the use of negative powers in place of "per". My Nuffield Physics O/A level books always referred to speeds in m.s^-1 and accelerations in m.s^-2 (where "^-1" denotes a superscript "-1" etc. The teacher was undecided as to how you pronounced that: was it "metres seconds-to-the-minus-1" or "metres per second"?

Negative superscript units always seemed to be a gimmick too far.

And then we get onto the thorny issue of "traditional" versus IUPAC names for chemical compounds - acetic versus ethanoic acid, isopropyl alcohol versus propan-2-ol: the traditional names are more familiar but the IUPAC names are more systematic and more accurately represent how the atoms are arranged. Familiar versus Sunday-school names ;-)

But the ultimate "grates like chalk on a blackboard" usage for me is kilometre pronounced "kill-OMM-i-TAH" when all other SI prefixes and units have the stress on the first syllable "KILL-o-ME-tre" (as for "MIcroMEtre", "MEGaMEtre" etc). It's hilarious to hear Prof Brian Cox flipping between "kill-OMM-i-TAH" which his director has probably told him is the trendy pronunciation and "KILL-o-ME-tre" which he always used in scientific and engineering work - sometimes he does it from one sentence to the next.

I once worked with a guy who used the trendy pronunciation for lengths of running races or distances along roads, and the scientific pronunciation for units in scientific/engineering contexts.

[The Natural Philosopher]

"On our constants and equations sheet, the italicized v stands for the greek letter nu, which is the variable for frequency. The regular v stands for velocity. On that sheet specifically, c = λ v and E = hv are the only equations that use the greek letter nu (frequency). Hope this helps!"

[Brian Gaff]

This makes my brain Hertz.

Brian

[Ralph Mowery]

Mine too. I still say cycles more than Hertz. Just as I often say 110 instead of 120 which is more like 125 volts now. Guess we need to rename or put a name on standard line voltages. Just call them Angie, bill, Carol for the 120, 240, 480 volts !!!

[upsidedown]

For conductance (1/R), suspectance and admittance (1/Z) the unit is Siemens (S).