About: http://webisa.webdatacommons.org/356170780

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	From your answer and other sources I get that 60 Hz could be detectable in the dark, 1 kHz would not, but I would like to reduce that interval.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com