About: http://webisa.webdatacommons.org/267670074

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	Since the velocity is a vector it is obvious how to add another velocity to get the resultant velocity, and I would guess this is why you are thinking that maybe we should consider the light as particles.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com