About: http://webisa.webdatacommons.org/449908883

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Preferably, the wave is an electromagnetic wave and has a frequency between 300 Hz and 20 MHz.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk