About: http://webisa.webdatacommons.org/29558141

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	In this case, distance L to the summing point is preferably selected so that L=??/4+n*??/2, when ?? is the wavelength and n is a positive integer or zero.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com