6 ms·
50 Hz is very characteristic for a power line close by but as you already ruled that out I have no clue. Nonetheless much to high for any seismic noise.
by krischer 11y ago
50 Hz is very characteristic for a power line close by but as you already ruled that out I have no clue. Nonetheless much to high for any seismic noise.
- CompuHacker 11y agoHe's in the US, which rules out 50Hz at any precision. He needs to take measurements.
- Someone 11y agoOn the other hand, without measurements, 60 Hz may be close enough to 50 Hz to include it in "around 50 Hz", depending on the OP's ability to estimate sound frequencies. But yes, measurements are the way to go.
- thyrsus 11y agoOn a piano, it's closest to the C three octaves below middle C, so around 33Hz. I regret my lack of perfect pitch.