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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "The Doppler effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source. It is named after the Austrian physicist Christian Doppler, who proposed it in 1842 in Prague. It is commonly heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer." ] ,
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        "http://dbpedia.org/ontology/soundRecording" : [ "http://dbpedia.org/resource/Doppler_effect__1" ] ,
        "http://dbpedia.org/ontology/thumbnail" : [ "http://commons.wikimedia.org/wiki/Special:FilePath/Doppler_effect_diagrammatic.svg?width=300"] } } }
