About: http://webisa.webdatacommons.org/180244715

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	Experiments have been done using a light frequency of 5.42???1014 Hz (green light), but somewhat lower frequencies such as 4.3???1014???5.0???1014 Hz may be preferred, and 4.5???1014???4.7???1014 Hz may be more preferred.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es