A semi-tone.
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He discovered the ratio of a perfect octave is 2:1.
He discovered the ratio interval of a perfect octave is 2:1.
Eight notes in an Octave
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Simply put, an octave per minute doubles the frequency every minute. If you start at 20 Hz at one ocatve per minute you get to 40Hz in one minute, 80Hz in 2 minutes, 160 Hz in three minutes, etc.