About: http://webisa.webdatacommons.org/21475729

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	The answer here comes from remembering that light is a transverse wave, i.e. that the electric field must be perpendicular to the direction of travel.
http://www.w3.org/ns/prov#wasQuotedFrom	skullsinthestars.com