All frequencies
202 entries. Search by name, number or note, and press play to hear one.
202 entries
- Solar Cycle (11-year)MeasuredEarth, Moon & SunThe activity of the Sun rises and falls over about 11 years: sunspots, flares and geomagnetic storms.2.90 × 10⁻⁹ Hz
- Circadian RhythmMeasuredBody rhythmsThe body’s daily clock, which sets the timing of sleep, hormone release and body temperature.1.16 × 10⁻⁵ Hz
- Ultradian Rhythm (90 min)MeasuredBody rhythmsA cycle of about 90 minutes, which is about 0.000185 Hz (1 ÷ 5,400 seconds).1.85 × 10⁻⁴ Hz
- Craniosacral RhythmSpeculativeBody rhythmsA rhythm that craniosacral therapists say they can feel. When tested, examiners did not agree on it.0.15 Hz
- Breathing Rate (Resting)MeasuredBody rhythmsA typical resting breathing rate is about 15 breaths a minute, which is 0.25 Hz.0.25 Hz
- Delta (Low)MeasuredBrainwave bands0.5 Hz is near the low end of the delta band of brain activity, as recorded by EEG (sensors on the scalp).0.5 Hz
- Human Heartbeat (Resting)MeasuredBody rhythmsA typical resting heart rate is about 70 beats a minute, which is 1.17 Hz.1.17 Hz
- Delta (Mid)MeasuredBrainwave bands2 Hz is in the middle of the delta band of brain activity, as recorded by EEG (sensors on the scalp).2.00 Hz
- Delta (High)MeasuredBrainwave bands3.5 Hz is near the top of the delta band of brain activity, as recorded by EEG (sensors on the scalp).3.50 Hz
- Theta (Low)MeasuredBrainwave bands4 Hz is the lower edge of the theta band of brain activity, as recorded by EEG (sensors on the scalp).4.00 Hz
- Theta (Mid)MeasuredBrainwave bands6 Hz is in the middle of the theta band of brain activity, as recorded by EEG (sensors on the scalp).6.00 Hz
- Theta (High)MeasuredBrainwave bands7.5 Hz is near the top of the theta band of brain activity, as recorded by EEG (sensors on the scalp).7.50 Hz
- Schumann Resonance (Fundamental)MeasuredEarth, Moon & SunA radio-wave resonance of the Earth’s atmosphere, measured near 7.8 Hz. It is not a sound and cannot be heard.7.83 Hz
- Alpha (Low)MeasuredBrainwave bands8 Hz is the lower edge of the alpha band of brain activity, as recorded by EEG (sensors on the scalp).8.00 Hz
- Alpha (Mid)MeasuredBrainwave bands10 Hz is in the middle of the alpha band of brain activity, as recorded by EEG (sensors on the scalp).10.00 Hz
- Alpha (High)MeasuredBrainwave bands12 Hz is near the top of the alpha band of brain activity, as recorded by EEG (sensors on the scalp).12.00 Hz
- Beta (Low)MeasuredBrainwave bands13 Hz is the edge between the alpha and beta bands of brain activity, as recorded by EEG (sensors on the scalp).13.00 Hz
- Schumann Resonance (2nd mode)MeasuredEarth, Moon & SunThe second mode of the cavity between the ground and the ionosphere.14.30 Hz
- C0StandardMusical notesThe note C0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.16.35 Hz
- C#0StandardMusical notesThe note C♯0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.17.32 Hz
- D0StandardMusical notesThe note D0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.18.35 Hz
- D#0StandardMusical notesThe note D♯0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.19.45 Hz
- Beta (Mid)MeasuredBrainwave bands20 Hz is in the middle of the beta band of brain activity, as recorded by EEG (sensors on the scalp).20.00 Hz
- E0StandardMusical notesThe note E0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.20.60 Hz
- Schumann Resonance (3rd mode)MeasuredEarth, Moon & SunThe third mode of the cavity between the ground and the ionosphere.20.80 Hz
- F0StandardMusical notesThe note F0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.21.83 Hz
- F#0StandardMusical notesThe note F♯0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.23.12 Hz
- G0StandardMusical notesThe note G0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.24.50 Hz
- G#0StandardMusical notesThe note G♯0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.25.96 Hz
- Schumann Resonance (4th mode)MeasuredEarth, Moon & SunThe fourth mode of the cavity between the ground and the ionosphere.27.30 Hz
- A0StandardMusical notesThe note A0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.27.50 Hz
- A#0StandardMusical notesThe note A♯0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.29.14 Hz
- Beta (High)MeasuredBrainwave bands30 Hz is the upper edge of the beta band of brain activity, as recorded by EEG (sensors on the scalp).30.00 Hz
- B0StandardMusical notesThe note B0 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.30.87 Hz
- C1StandardMusical notesThe note C1 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.32.70 Hz
- Schumann Resonance (5th mode)MeasuredEarth, Moon & SunThe fifth mode of the cavity between the ground and the ionosphere.33.80 Hz
- C#1StandardMusical notesThe note C♯1 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.34.65 Hz
- D1StandardMusical notesThe note D1 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.36.71 Hz
- D#1StandardMusical notesThe note D♯1 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.38.89 Hz
- Gamma (Low)MeasuredBrainwave bands40 Hz is in the gamma band of brain activity, as recorded by EEG (sensors on the scalp).40.00 Hz
- 40 Hz Binaural BeatSpeculativeClaimed frequenciesA pulse you hear when each ear is given a slightly different tone. The Alzheimer’s research often cited with it used light and clicks, not binaural beats.40.00 Hz
- E1StandardMusical notesThe note E1 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.41.20 Hz
- F1StandardMusical notesThe note F1 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.43.65 Hz
- F#1StandardMusical notesThe note F♯1 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.46.25 Hz
- G1StandardMusical notesThe note G1 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.49.00 Hz
- G#1StandardMusical notesThe note G♯1 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.51.91 Hz
- A1StandardMusical notesThe note A1 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.55.00 Hz
- A#1StandardMusical notesThe note A♯1 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.58.27 Hz
- B1StandardMusical notesThe note B1 in standard tuning, where the A above middle C is 440 Hz. Its value is set by definition.61.74 Hz
- Didgeridoo (Fundamental)TraditionalInstruments & gongsThe didgeridoo produces a deep drone typically around 50-80 Hz.65.00 Hz