{"id":50697,"date":"2022-12-07T20:30:00","date_gmt":"2022-12-07T23:30:00","guid":{"rendered":"https:\/\/www.ufrgs.br\/amlef\/?p=50697"},"modified":"2022-12-09T18:46:28","modified_gmt":"2022-12-09T21:46:28","slug":"movimento-acustica-das-ondas-ao-som","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/amlef\/2022\/12\/07\/movimento-acustica-das-ondas-ao-som\/","title":{"rendered":"Movimento: Ac\u00fastica, das ondas ao&nbsp;som"},"content":{"rendered":"\n<figure class=\"wp-block-image alignright size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/reguaMusical-1-1024x251.jpg\" alt class=\"wp-image-50727\" width=\"512\" height=\"126\" srcset=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/reguaMusical-1-1024x251.jpg 1024w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/reguaMusical-1-300x74.jpg 300w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/reguaMusical-1-768x188.jpg 768w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/reguaMusical-1-205x50.jpg 205w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/reguaMusical-1-480x118.jpg 480w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/reguaMusical-1.jpg 1280w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\"><figcaption class=\"wp-element-caption\">Figura 1. Fa\u00e7a voc\u00ea mesmo! prenda uma r\u00e9gua \u00e0 mesa e puxe a ponta solta para cima e largue. Teste prend\u00ea-la em pontos dife\u00adren\u00adtes e ou\u00e7a o que acontece!<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Voc\u00ea sabe o que \u00e9 uma onda? Aquela onda do mar, indo e vindo, que\u00adbrando pr\u00f3xima \u00e0 praia. Pois ent\u00e3o, o assunto \u00e9 muito mais amplo do que isso. Voc\u00ea pode fixar fir\u00adme\u00admente uma l\u00e2mina met\u00e1\u00adlica ao tampo de uma mesa, sus\u00adpen\u00adder a extre\u00admi\u00addade livre da l\u00e2mina e soltar. O qu\u00ea acon\u00adtece? Voc\u00ea ouvir\u00e1 um som! Esse som \u00e9 pro\u00addu\u00adzido pelo movi\u00admento de vai-e-vem \u2013 osci\u00adla\u00ad\u00e7\u00e3o \u2013 da l\u00e2mina, que per\u00adturba o ar no seu entorno, pro\u00addu\u00adzindo, alter\u00adna\u00adda\u00admente, com\u00adpres\u00ads\u00f5es e rare\u00adfa\u00ad\u00e7\u00f5es de ar. Essas per\u00adtur\u00adba\u00ad\u00e7\u00f5es viajam desde a l\u00e2mina at\u00e9 alcan\u00ad\u00e7a\u00adrem nossos ouvidos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mas o que o som tem a ver com uma onda do mar? Assim como essa, o som \u00e9 uma onda mec\u00e2\u00adnica. Essas s\u00e3o per\u00adtur\u00adba\u00ad\u00e7\u00f5es peri\u00f3\u00addi\u00adcas do meio, que se pro\u00adpa\u00adgam em todas as dire\u00ad\u00e7\u00f5es a partir do ponto em que foram pro\u00addu\u00adzi\u00addas. Fen\u00f4\u00adme\u00adnos ondu\u00adla\u00adt\u00f3\u00adrios possuem um inter\u00advalo de tempo bem defi\u00adnido entre os eventos que se repetem, deno\u00admi\u00adnado <strong>per\u00edodo<\/strong> do fen\u00f4\u00admeno, e o n\u00famero de eventos pro\u00addu\u00adzi\u00addos na unidade de tempo \u00e9 chamado <strong>frequ\u00ean\u00adcia<\/strong> do fen\u00f4\u00admeno. A unidade de medida de frequ\u00ean\u00adcias \u00e9 o <strong>hertz (Hz)<\/strong>. Um hertz repre\u00adsenta uma osci\u00adla\u00ad\u00e7\u00e3o a cada segundo: <strong>1 Hz = 1\/s<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image alignleft size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/ondaSonora1-1024x304.png\" alt class=\"wp-image-50720\" width=\"512\" height=\"152\" srcset=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/ondaSonora1-1024x304.png 1024w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/ondaSonora1-300x89.png 300w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/ondaSonora1-768x228.png 768w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/ondaSonora1-1536x456.png 1536w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/ondaSonora1-205x61.png 205w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/ondaSonora1-480x142.png 480w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/ondaSonora1.png 1544w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\"><figcaption class=\"wp-element-caption\">Figura 2. Repre\u00adsen\u00adta\u00ad\u00e7\u00e3o de uma onda sonora, com zonas de baixa e alta press\u00e3o. Adap\u00adtado de: U(iki)TFPR, <a href=\"https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\">CC BY-SA 4.0<\/a>, via Wiki\u00adme\u00addia Commons.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">O som \u00e9 uma <strong>onda mec\u00e2\u00adnica<\/strong>, pois precisa de um meio para per\u00adtur\u00adbar e, assim, pro\u00adpa\u00adgar-se. \u00c9 clas\u00adsi\u00adfi\u00adcado como uma <strong>onda<\/strong> <strong>lon\u00adgi\u00adtu\u00addi\u00adnal<\/strong> para carac\u00adte\u00adri\u00adzar o fato que a osci\u00adla\u00ad\u00e7\u00e3o das par\u00adt\u00ed\u00adcu\u00adlas do meio acon\u00adtece na mesma dire\u00e7\u00e3o em que a pr\u00f3pria onda se propaga; dife\u00adren\u00adte\u00admente de ondas trans\u00adver\u00adsais em uma corda, que oscilam para cima e para baixo enquanto a onda se desloca de um lado a outro. Perceba que, enquanto a onda sonora passa, cada par\u00adt\u00ed\u00adcula do meio oscila para a frente e para tr\u00e1s em torno de um ponto fixo no espa\u00e7o, empur\u00adrando e puxando as par\u00adt\u00ed\u00adcu\u00adlas vizi\u00adnhas, mas n\u00e3o sendo car\u00adre\u00adgada pela&nbsp;onda.<\/p>\n\n\n\n<div style=\"height:0px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image alignright size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/Calculated_Travel_Time_Map_for_1964_Alaska_Tsunami.jpg\" alt class=\"wp-image-50725\" width=\"384\" height=\"358\" srcset=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/Calculated_Travel_Time_Map_for_1964_Alaska_Tsunami.jpg 512w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/Calculated_Travel_Time_Map_for_1964_Alaska_Tsunami-300x279.jpg 300w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/Calculated_Travel_Time_Map_for_1964_Alaska_Tsunami-205x191.jpg 205w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2022\/12\/Calculated_Travel_Time_Map_for_1964_Alaska_Tsunami-480x447.jpg 480w\" sizes=\"auto, (max-width: 384px) 100vw, 384px\"><figcaption class=\"wp-element-caption\">Figura 3. Tempo (em horas) cal\u00adcu\u00adlado para viagem dos tsu\u00adna\u00admis gerados pelo Grande Ter\u00adre\u00admoto do Alasca, de 1964; perceba a dis\u00adt\u00e2n\u00adcia viajada pelas ondas. Fonte: NGDC, <a href=\"https:\/\/creativecommons.org\/licenses\/by-sa\/3.0\">CC BY-SA 3.0<\/a>, via Wiki\u00adme\u00addia Commons.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c9 impor\u00adtante res\u00adsal\u00adtar um aspecto fun\u00adda\u00admen\u00adtal: em toda onda mec\u00e2\u00adnica, a dis\u00adt\u00e2n\u00adcia que a mat\u00e9ria se desloca quando a onda passa \u00e9 insig\u00adni\u00adfi\u00adcante quando com\u00adpa\u00adrada \u00e0 dis\u00adt\u00e2n\u00adcia que a pr\u00f3pria onda viaja. Isso \u00e9 verdade at\u00e9 para uma grande onda do mar, cuja altura \u00e9 muito menor que a dis\u00adt\u00e2n\u00adcia de onde ela veio. Diz-se que, na pr\u00e1tica, n\u00e3o h\u00e1 trans\u00adporte de mat\u00e9ria pro\u00addu\u00adzido por uma onda. Mas n\u00e3o se deixe enganar, o estudo das ondas n\u00e3o deixa de ser um estudo do movi\u00admento, apesar de his\u00adto\u00adri\u00adca\u00admente serem tra\u00adta\u00addos separadamente.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Curiosidade:<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Existem outros tipos de eventos repe\u00adti\u00adti\u00advos que podem ser des\u00adcri\u00adtos como ondas. Essas ondas podem ser clas\u00adsi\u00adfi\u00adca\u00addas de acordo com a sua natu\u00adreza: mec\u00e2\u00adnica, ele\u00adtro\u00admag\u00adn\u00e9\u00adtica ou gra\u00advi\u00adta\u00adci\u00ado\u00adnal. Essa \u00faltima foi obser\u00advada expe\u00adri\u00admen\u00adtal\u00admente pela pri\u00admeira vez em 2015, apesar de ter sido ima\u00adgi\u00adnada em 1893, por Oliver Hea\u00advi\u00adside, e pre\u00advista em 1916, por Albert Einstein.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h5 class=\"has-text-align-right wp-block-heading\">Maria Eduarda Bell\u00f3 e Rog\u00e9rio Nunes Wolff \/ Equipe AMLEF&nbsp;2022<\/h5>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-4adc9cd0 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity is-style-wide\">\n\n\n\n<h2 class=\"wp-block-heading\">Refer\u00eancias:<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Wiki\u00adp\u00e9\u00addia: Som (<a href=\"https:\/\/pt.wikipedia.org\/wiki\/Som\">PT<\/a>\/<a href=\"https:\/\/en.wikipedia.org\/wiki\/Sound\">EN<\/a>)<\/li>\n\n\n\n<li>Wiki\u00adp\u00e9\u00addia: Onda (<a href=\"https:\/\/pt.wikipedia.org\/wiki\/Onda\">PT<\/a>\/<a href=\"https:\/\/en.wikipedia.org\/wiki\/Wave\">EN<\/a>)<\/li>\n\n\n\n<li><a href=\"https:\/\/noic.com.br\/wp-content\/uploads\/2021\/05\/Moyses_2.pdf\">NUSSENZVEIG, H. Moys\u00e9s. Curso de F\u00edsica B\u00e1sica 2: fluidos, osci\u00adla\u00ad\u00e7\u00f5es e ondas, calor. 5\u00aa edi\u00e7\u00e3o. S\u00e3o Paulo: Blucher, 2014<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Voc\u00ea sabe o que \u00e9 uma onda? Aquela onda do mar, indo e vindo, que\u00adbrando pr\u00f3xima \u00e0 praia. Pois ent\u00e3o, o assunto \u00e9 muito mais amplo do que isso. Mas o que o som tem a ver com uma onda do mar? Essa viagem come\u00e7a por&nbsp;aqui.<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","wp_typography_post_enhancements_disabled":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[432,582,583],"tags":[603,606,586,520,591,605,604,607],"class_list":["post-50697","post","type-post","status-publish","format-standard","hentry","category-destaques","category-expo2024-o-acervo-contra-ataca","category-exposicoes","tag-acustica","tag-arte","tag-expo2022","tag-historia","tag-mecanica-classica","tag-musica","tag-ondas","tag-som"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Movimento: Ac\u00fastica, das ondas ao som - Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ufrgs.br\/amlef\/2022\/12\/07\/movimento-acustica-das-ondas-ao-som\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Movimento: Ac\u00fastica, das ondas ao som - Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"Voc\u00ea sabe o que \u00e9 uma onda? Aquela onda do mar, indo e vindo, quebrando pr\u00f3xima \u00e0 praia. Pois ent\u00e3o, o assunto \u00e9 muito mais amplo do que isso. Mas o que o som tem a ver com uma onda do mar? 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