2 ms·

The definition of the second is not arbitrary. It has deep historic roots.

• rowanG077 5y ago
  That is the meaning of arbitrary. It doesn't have any relation to the way sound is perceived. So the power of two relation either doesn't matter or is a coincidence.
  • ofou 5y ago
    It's about order and congruence. This is why standards are created. I don't see good reasons for A=440 either.