Frequency Chart
From Ultrasound to Infrasound
(Not to scale)
100MHz to 300 MHz
Ultrahigh frequencies used for optical resolution medical imaging.
20KHz +
Ultrasonic frequencies
20Hz to 20KHz
This is the range of frequencies that the human ear can register
17.4 KHz
This is the frequency used in mosquito alarms, contested anti-loitering devices used to deter teenagers away from public areas
16KHz +
High frequencies that can barely be heard by the human ear
4186 Hz
The highest note on a standard piano (C8)
2040 Hz
Average Frequency of long distance whalesong
1050 Hz to 2350 Hz
Whistle tones
264 Hz
'Middle C' on a Piano (C4)
25 Hz to 100 Hz
The frequency range of a cat's purr
52 Hz
The 'loneliest' frequency: the 52 Hz whale
40-50 Hz
average frequency of automobile exhausts
>35Hz
Gamma Frequencies of brain activity associated with concentration
Lowest note on a Piano (A0)
27.5 Hz
19 Hz to 21 Hz
The Fear Frequency / Nightmare Frequency
20 Hz >
Infrasonic frequencies
12 Hz to 35 Hz
Beta Frequencies associated with anxiety
8 Hz to 12 Hz
Alpha Frequencies associated with relaxation
4 Hz to 8 Hz
7 Hz
​
Danger Frequency - Resonant frequency of human internal organs
Theta Frequencies associated with REM sleep
5 Hz
Resonant Frequency of the Human body
0.5 Hz to 4 Hz
Delta Frequencies - Sleep
No Frequency - Silence
0