About: http://webisa.webdatacommons.org/96976425

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	Polarization occurs in the electric field E applied to the emitter section 14 represented by E=Vak/d, where d is a width of the slit (see FIG. 1), and Vak is a voltage between the cathode electrode 16 and the anode electrode 20.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk