Would wall sockets glow if human eye could see light at 50Hz? The title is self-explanatory. I know that the electrons at the tip of Live get pushed in and out with respect to Neutral. (You shouldn't say there is no current; since there is air, a poor conductor, but still a conductor)
Does this back and forth motion of electrons cause emittance of photons at 50/60Hz? If so, assuming we have gained some 50/60Hz light-sensitive cells on our retina due to pure chance, don't you think it would be fun to see a glow around wall sockets and wouldn't you use it as a sleeping lamp?
 A: The problem isn't the socket, it's the eye. To answer directly, if the eye could see at 50 Hz, yep, you'd see it glowing. It appears that you can see single photons, on average, so the leakage from your wiring would be more than enough. But...
Very generally, to get reasonable "reception" you need an "antenna" that is resonant at the frequency in question. This is why old-school VHF TV antennas have multiple arms sticking out of them, each one is resonant at a different frequency so that it has broader frequency response. The shortest you can really go is about 1/4 the wavelength, although cell phones and such are often shorter.
Of course, human vision isn't based directly on little antennas but the visual receptor proteins like visual purple. These do have wavelength-sensitive structure which makes them relatively highly turned to specific frequencies. So then in order to see 50 Hz, you would need cones with a new visual protein in them.
Assuming that protein has something like a quarter-wave dipole structure, to be sensitive to 50 Hz it would have to be about 150 km long. The eyeball needed to hold that... well...
So, yes but no!
