Recognised as Musical note

C#1

C#1
34.65 Hz
MIDI 25

C#1 (enharmonically Db1) is MIDI note 25, sounding at 34.648 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 9.8996 m, and it sits in octave 1.

Pitch

Scientific pitch notationC#1

Enharmonic equivalentDb1the same pitch in equal temperament, spelled differently

MIDI note number25

Frequency34.6478 Hzequal temperament, A4 = 440 Hz, a convention rather than a constant

Pitch classC# (1)

Octave1

As a sound wave

Wavelength in air9.8996 mat 343 m/s, dry air at 20 °C

Period28.8618 ms

Frequency one octave up69.296 Hzdoubling the frequency

Frequency one octave down17.324 Hz

AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age

Intervals from here

Octave belowC#0 · 17.32 Hz

Perfect fifth belowF#0 · 23.12 Hz

Semitone belowC1 · 32.7 Hz

Semitone aboveD1 · 36.71 Hz

Major third aboveF1 · 43.65 Hz

Perfect fifth aboveG#1 · 51.91 Hz

Octave aboveC#2 · 69.3 Hz

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Nearby notes

The same note in other octaves

Also reads as

NOTeCSHArP1 (chemical formula)

Formula
273.609 g/mol
8 atoms

NOTeCSHArP1 has a molar mass of 273.609 g/mol, made up of 8 atoms across 8 elements: 1 × N, 1 × O, 1 × Te, 1 × C, 1 × S, 1 × H, 1 × Ar, 1 × P.

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Molar mass

Molar mass273.609 g/mol

Total atoms per molecule8

Distinct elements8

Mass of one molecule4.5433843 × 10^-22 g

Molecules per gram2.2010024 × 10^21

Name

NameNot in the name tablea name cannot be worked out from a formula alone: isomers share formulas, and naming depends on bonding the formula does not show