.523 kHz = 523 Hz
D3 146.8 Hz G3 196.0 Hz B3 246.9 Hz E4 329.6 Hz
2 400 000 000 Hz
none
There are 3octaves = 90, 180, 360, 720
A billion.
650x10^6Hz
log2(6400/100) = log2(64) = 6
100
There is no fixed connection between frequency (Hertz) and voltage, you can have 60 Hz at any voltage.
1200
10 Hz 10 Hz