{ "items" : [
    { "id" : "http://dbpedia.org/resource/Frank–Tamm_formula"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "The Frank–Tamm formula yields the amount of Cherenkov radiation emitted on a given frequency as a charged particle moves through a medium at superluminal velocity."] } } }
