{"id":281,"date":"2013-10-11T15:15:48","date_gmt":"2013-10-11T15:15:48","guid":{"rendered":"https:\/\/blogs.ua.es\/ffic\/?p=281"},"modified":"2013-11-01T10:42:09","modified_gmt":"2013-11-01T10:42:09","slug":"oscil%c2%b7lacions-i-ones-3","status":"publish","type":"post","link":"https:\/\/blogs.ua.es\/ffic\/2013\/10\/11\/oscil%c2%b7lacions-i-ones-3\/","title":{"rendered":"Tema 2. Oscil\u00b7lacions i ones (III)"},"content":{"rendered":"<p style=\"text-align: justify\">L&#8217;\u00faltima sessi\u00f3 d&#8217;aquest bloc es dedica a l&#8217;estudi de les <strong>ones sonores<\/strong>. Definirem el so i analitzarem la seua propagaci\u00f3. S&#8217;obtindr\u00e0 la velocitat del so en funci\u00f3 del medi de propagaci\u00f3, aix\u00ed com les caracter\u00edstiques del so d&#8217;intensitat, pot\u00e8ncia i pressi\u00f3 ac\u00fastica. Tamb\u00e9 es definiran els nivells d&#8217;intensitat ac\u00fastica, de pot\u00e8ncia ac\u00fastica i de pressi\u00f3 ac\u00fastica. Finalment, s&#8217;analitzar\u00e0 que succeeix quan un emissor i receptor es troben en moviment relatiu en relaci\u00f3 amb el medi en qu\u00e8 es propaga l&#8217;ona. Aquest fenomen s&#8217;anomena <strong>efecte Doppler<\/strong>. Exemples quotidians s\u00f3n el canvi de to d&#8217;un cotxe de policia o ambul\u00e0ncia quan se&#8217;ns apropa o se&#8217;ns allunya.<\/p>\n<p style=\"text-align: justify\">Quan una font es mou a major velocitat que la de propagaci\u00f3 de l&#8217;ona emesa, les ones es concentren rere la font i formen el que s&#8217;anomena una <strong>ona de xoc<\/strong>. En el cas de les ones sonores, quan l&#8217;ona de xoc arriba al receptor es percep una mena d&#8217;espetec.<\/p>\n<p style=\"text-align: justify\">En el seg\u00fcent v\u00eddeo podeu escoltar i veure diversos espetecs d&#8217;avions supers\u00f2nics (extret de YouTube on podeu trobar m\u00e9s exemples).<\/p>\n<p style=\"text-align: justify\"><code>[kml_flashembed movie=\"http:\/\/www.youtube.com\/v\/6o0zmafxTmE\" width=\"640\" height=\"480\" wmode=\"transparent\" \/]<\/code><\/p>\n<p style=\"text-align: justify\">Els terratr\u00e8mols produeixen vibracions en el terreny i una part d&#8217;energia d&#8217;aquest s&#8217;emet en forma d&#8217;ones s\u00edsmiques. Aquestes ones fan vibrar el terreny al llarg d&#8217;un interval de freq\u00fc\u00e8ncies ampli. Per aquesta ra\u00f3 \u00e9s molt important identificar les \u00e0rees susceptibles de patir danys importants per terratr\u00e8mols i complir amb les corresponents normatives de seguretat en les construccions de ponts, esculleres i edificis.<\/p>\n<p style=\"text-align: justify\">La bibliografia d&#8217;aquest bloc i la versi\u00f3 en castell\u00e0 les podeu consultar <a href=\"https:\/\/blogs.ua.es\/ffic\/programa\/tema2\">ac\u00ed<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L&#8217;\u00faltima sessi\u00f3 d&#8217;aquest bloc es dedica a l&#8217;estudi de les ones sonores. Definirem el so i analitzarem la seua propagaci\u00f3. S&#8217;obtindr\u00e0 la velocitat del so en funci\u00f3 del medi de propagaci\u00f3, aix\u00ed com les caracter\u00edstiques del so d&#8217;intensitat, pot\u00e8ncia i &hellip; <a href=\"https:\/\/blogs.ua.es\/ffic\/2013\/10\/11\/oscil%c2%b7lacions-i-ones-3\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2285,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9319,1366],"tags":[9330,1580705],"class_list":["post-281","post","type-post","status-publish","format-standard","hentry","category-asignatura-2","category-temas","tag-asignatura-3","tag-temas"],"_links":{"self":[{"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/posts\/281","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/users\/2285"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/comments?post=281"}],"version-history":[{"count":22,"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/posts\/281\/revisions"}],"predecessor-version":[{"id":351,"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/posts\/281\/revisions\/351"}],"wp:attachment":[{"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/media?parent=281"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/categories?post=281"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/tags?post=281"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}