{"id":444088,"date":"2017-09-04T02:00:00","date_gmt":"2017-09-03T23:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=cb9e24ac2b4cd84dd7d476d35a9b907d"},"modified":"2017-09-04T02:00:00","modified_gmt":"2017-09-03T23:00:00","slug":"understanding-the-doppler-effect-by-analysing-spectrograms-of-the-sound-of-a-passing-vehicle","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=444088","title":{"rendered":"Understanding the Doppler effect by analysing spectrograms of the sound of a passing vehicle"},"content":{"rendered":"<p>The purpose of this paper is to demonstrate how the Doppler effect can be analysed to deduce<br \/>\ninformation about a moving source of sound waves. Specifically, we find the speed of a car and the<br \/>\ndistance of its closest approach to an observer using sound recordings from smartphones. A key focus<br \/>\nof this paper is how this can be achieved in a classroom, both theoretically and experimentally, to<br \/>\ndeepen students\u2019 understanding of the Doppler effect. Included are our own experimental data (48<br \/>\nsound recordings) to allow others to reproduce the analysis, if they cannot repeat the whole<br \/>\nexperiment themselves. In addition to its educational purpose, this paper examines the percentage<br \/>\nerrors in our results. This enabled us to determine sources of error, allowing those conducting<br \/>\nsimilar future investigations to optimize their accuracy.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The purpose of this paper is to demonstrate how the Doppler effect can be analysed to deduce<br \/>\ninformation about a moving source of sound waves. Specifically, we find the speed of a car and the<br \/>\ndistance of its closest approach to an observer using soun&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-444088","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/444088","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=444088"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/444088\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=444088"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=444088"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=444088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}