About: http://webisa.webdatacommons.org/418835379

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	Light is an electromagnetic wave, the electric field strength components of which are oscillating with the optical angular frequency U in the x-y plane orthogonal to the propagation direction z.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com