2:1
2:3
2:1
He discovered the ratio of a perfect octave is 2:1.
perfect fourth !
A perfect octave
He discovered the ratio interval of a perfect octave is 2:1.
Perfect
Perfect
Perfect fourth
Perfect
Perfect octave.
perfect fourth
An octave is defined as two notes, one of which is twice the frequency (vibrations per second) as the other; also two notes with an interval between them of 8 diatonic degrees.
normal interval, close interval, and double interval