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CompuHacker
on April 21, 2015
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Have you heard 'the hum'? Mystery of Earth's low d...
He's in the US, which rules out 50Hz at any precision. He needs to take measurements.
Someone
on April 22, 2015
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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.
thyrsus
on April 23, 2015
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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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