Assertion: sound wave's frequency | /r/HasProperty | 50 hz
Facets:
value: in europe
type: LOCATION
Source sentences:
text: In Europe, Africa, Australia, Southern South America, most of Asia, and Russia, the frequency of the alternating current in household electrical outlets is 50 Hz (close to the tone G), whereas in North America and Northern South America, the frequency of the alternating current in household electrical outlets is 60 Hz (between the tones B♭ and B; that is, a minor third above the European frequency).