That's normal. CRTs emit a faint sound at just under 16kHz, which is in hearing range for most children but not most adults as the upper end of this range natur

That's normal. CRTs emit a faint sound at just under 16kHz, which is in hearing range for most children but not most adults as the upper end of this range naturally decreases with age. The article is about radio frequency electromagnetic waves, at much higher frequencies.