Recognised as Musical note
F4
- F4
- 349.23 Hz
- MIDI 65
F4 is MIDI note 65, sounding at 349.228 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 0.9822 m, and it sits in octave 4.
Pitch
Scientific pitch notationF4
MIDI note number65
Pitch classF (5)
Octave4
As a sound wave
Wavelength in air0.9822 mat 343 m/s, dry air at 20 °C
Period2.8635 ms
Frequency one octave down174.614 Hz
AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age
Intervals from here
Octave belowF3 · 174.61 Hz
Perfect fifth belowA#3 · 233.08 Hz
Semitone belowE4 · 329.63 Hz
Semitone aboveF#4 · 369.99 Hz
Major third aboveA4 · 440 Hz
Perfect fifth aboveC5 · 523.25 Hz
Octave aboveF5 · 698.46 Hz
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Also reads as
NOTeF4 (chemical formula)
- Formula
- 233.598 g/mol
- 7 atoms
NOTeF4 has a molar mass of 233.598 g/mol, made up of 7 atoms across 4 elements: 1 × N, 1 × O, 1 × Te, 4 × F.
Molar mass
Molar mass233.598 g/mol
Total atoms per molecule7
Distinct elements4
Mass of one molecule3.8789861 × 10^-22 g
Molecules per gram2.5779933 × 10^21
Composition by mass
N6%
O6.8%
Te54.6%
F32.5%
Nitrogen (N)14.007 g/mol, 5.996%
Oxygen (O)15.999 g/mol, 6.849%
Tellurium (Te)127.6 g/mol, 54.624%
Fluorine (F × 4)75.992 g/mol, 32.531%
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