{"id":440462,"date":"2017-08-17T02:00:00","date_gmt":"2017-08-16T23:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=542f701de32295f7f6da9ba57086d0c0"},"modified":"2017-08-17T02:00:00","modified_gmt":"2017-08-16T23:00:00","slug":"demonstration-of-acoustic-resonances-in-a-cylindrical-cavity-applying-the-photoacoustic-technique","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=440462","title":{"rendered":"Demonstration of acoustic resonances in a cylindrical cavity applying the photoacoustic technique"},"content":{"rendered":"<p>In this work we present some experiments which can be performed in college or on the first courses<br \/>\nof university to acquire knowledge about resonant acoustical phenomena in closed cavities in a<br \/>\ntangible way, through experiments based on the photoacoustic effect in gases. This phenomenon<br \/>\nconsists in the generation of acoustic waves after optical excitation of an absorbing gas and<br \/>\nfurther local heating of the non-absorbing surrounding gas by energy exchange through collisions<br \/>\nbetween molecules of both species. Simple experiments, performed with daily live elements, can be<br \/>\nvery useful for teachers and students to get in touch with the phenomenon of acoustic resonances<br \/>\nwith the addition of concepts about light\u2013matter interaction. The setups consist of the resonant<br \/>\ncavity, the illumination source and the signal detection-acquisition scheme. In this paper a closed<br \/>\nglass test tube is used as the resonant cavity and is filled with a mixture of nitrogen dioxide and<br \/>\nair. The illumination &#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this work we present some experiments which can be performed in college or on the first courses<br \/>\nof university to acquire knowledge about resonant acoustical phenomena in closed cavities in a<br \/>\ntangible way, through experiments based on the photoacou&#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-440462","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\/440462","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=440462"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/440462\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=440462"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=440462"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=440462"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}