there is no relation between voltage and frequency. The U.S. uses 60 Hz while Europe uses 50 hz, and the military uses something like 70 Hz IIRC. Europe actually has the right idea. 60hz is the frequency that makes muscles contract, so that when you are getting electrocuted you hold on. Whereas 50Hz makes your muscles expand, throwing you away from the short.
yea... silly me... that relation is not Volt/Herz but Herz/Frame rate of TV signal!
0.1 - Normal Ball Python... Note: English is not my native... so please bear with me