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by CompuHacker 4075 days ago
He's in the US, which rules out 50Hz at any precision. He needs to take measurements.
2 comments
Someone 4074 days ago
On 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.

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thyrsus 4073 days ago
On a piano, it's closest to the C three octaves below middle C, so around 33Hz. I regret my lack of perfect pitch.
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