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Originally Posted by blahblah454
Collectively, these waves are called 'The Schumann Resonance',
the current strongest at 7.8 Hz.
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In case anyone is interested, the musical pitch at 7.8 Hz is somewhere between B and C. The lowest note on the piano keyboard is A (27.5 Hz), so this pitch would be almost two octaves lower than that. Each octave is either half or double the starting frequency, depending on whether you're going up or down.
Also, the Schumann Resonance fluctuates between 9 and 12 Hz (which is where the human alpha waves resonate), and these pitches would be between D and G (slightly higher than the B and C mentioned earlier).