{"id":353228,"date":"2017-01-16T03:00:00","date_gmt":"2017-01-16T00:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=6d90d7092a9c681e2fc3dda93515a411"},"modified":"2017-01-16T03:00:00","modified_gmt":"2017-01-16T00:00:00","slug":"teaching-the-doppler-effect-in-astrophysics","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=353228","title":{"rendered":"Teaching the Doppler effect in astrophysics"},"content":{"rendered":"<p>The Doppler effect is a shift in the frequency of waves emitted from an object moving relative to<br \/>\nthe observer. By observing and analysing the Doppler shift in electromagnetic waves from<br \/>\nastronomical objects, astronomers gain greater insight into the structure and operation of our<br \/>\nUniverse. In this paper, a simple technique is described for teaching the basics of the Doppler<br \/>\neffect to undergraduate astrophysics students using acoustic waves. An advantage of the technique is<br \/>\nthat it produces a visual representation of the acoustic Doppler shift. The equipment comprises a 40<br \/>\nkHz acoustic transmitter and a microphone. The sound is bounced off a computer fan and the signal<br \/>\ncollected by a DrDAQ ADC and processed by a spectrum analyser. Widening of the spectrum is observed<br \/>\nas the fan power supply potential is increased from 4 to 12 V.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Doppler effect is a shift in the frequency of waves emitted from an object moving relative to<br \/>\nthe observer. By observing and analysing the Doppler shift in electromagnetic waves from<br \/>\nastronomical objects, astronomers gain greater insight into the&#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-353228","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\/353228","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=353228"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/353228\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=353228"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=353228"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=353228"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}