Beats/cents

[Ron Nossaman]

> Julia asks:
>> Would someone please confirm or correct...
>> If A4 on a piano is tuned to 443cps then it is tuned about 11.466  cents 
> sharp. Correct?
> 
> Very close.  It is actually 11.76 cents.  The formula involves a logarithm, and so it is only approximated by the proportionality equation that you used.
> 
> Robert Scott

Or 11.7638100364, or however many decimal places you like, the 
formula being 1200*LN(freq2/freq1)/LN(2).
Ron N