Recognised as Musical note
D9
- D9
- 9,397.27 Hz
- MIDI 122
D9 is MIDI note 122, sounding at 9,397.273 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 0.0365 m, and it sits in octave 9.
Pitch
Scientific pitch notationD9
MIDI note number122
Pitch classD (2)
Octave9
As a sound wave
Wavelength in air0.0365 mat 343 m/s, dry air at 20 °C
Period0.1064 ms
Frequency one octave up18,794.545 Hzdoubling the frequency
Frequency one octave down4,698.636 Hz
AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age
Intervals from here
Octave belowD8 · 4,698.64 Hz
Perfect fifth belowG8 · 6,271.93 Hz
Semitone belowC#9 · 8,869.84 Hz
Semitone aboveD#9 · 9,956.06 Hz
Major third aboveF#9 · 11,839.82 Hz
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