520 Hz Sine Wave Sound Frequency Tone

[thephantom]

I found this by first searching for the color cyan. It said the color's frequency was around 500 and 520 nm. I like the 520 better than 500. (Probably not the same sound it was mentioning? But found it interesting and nice sounding)

[EpicPuzl]

Play the two together and you'll hear that they're different :)

[andreasg]

Since a few days I hear this tone every night very quiet. What could be the reason??? Could it be a shoo for moles?