{"id":4837,"date":"2013-01-14T21:30:17","date_gmt":"2013-01-15T00:30:17","guid":{"rendered":"http:\/\/scienceblogs.com.br\/hypercubic\/?p=4837"},"modified":"2020-09-04T10:23:40","modified_gmt":"2020-09-04T13:23:40","slug":"acstica-da-balada","status":"publish","type":"post","link":"https:\/\/www.blogs.unicamp.br\/hypercubic\/2013\/01\/acstica-da-balada\/","title":{"rendered":"Ac\u00fastica da Balada"},"content":{"rendered":"\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p align=\"justify\">Instituto Polit\u00e9cnico do Brooklyn, 1958. O engenheiro ac\u00fastico William MacLean investiga um problema important\u00edssimo, com s\u00e9rias repercurs\u00f5es sociais: <em>Quantos convidados podem participar de uma festa antes que ela se torne barulhenta demais para manter uma conversa?<\/em> McLean encontrou uma resposta e expressou-a na seguinte f\u00f3rmula:<\/p>\n<p align=\"center\"><img decoding=\"async\" alt=\"cocktail party noise\" src=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2013\/01\/2013-01-05-din-minimum1.png\" width=\"249\" height=\"75\"><\/p>\n<p align=\"justify\">onde:<\/p>\n<ul>\n<li>\n<div align=\"justify\"><strong>N<sub>o<\/sub><\/strong> = o n\u00famero cr\u00edtico de convidados, acima do qual cada pessoa ter\u00e1 que elevar a voz para se fazer mais clara em meio ao ru\u00eddo do ambiente;<\/div>\n<\/li>\n<li>\n<div align=\"justify\"><strong>K<\/strong> = o n\u00famero de convidados em cada rodinha de conversa;<\/div>\n<\/li>\n<li>\n<div align=\"justify\"><strong>a<\/strong> = a m\u00e9dia do coeficiente de absor\u00e7\u00e3o sonora da sala;<\/div>\n<\/li>\n<li>\n<div align=\"justify\"><strong>V<\/strong> = o volume da sala;<\/div>\n<\/li>\n<li>\n<div align=\"justify\"><strong>h<\/strong> = a m\u00e9dia ponderada da trajet\u00f3ria livre de uma onda sonora;<\/div>\n<\/li>\n<li>\n<div align=\"justify\"><strong>d<sub>o<\/sub><\/strong> = a dist\u00e2ncia m\u00ednima convencional entre dois falantes;<\/div>\n<\/li>\n<li>\n<div align=\"justify\"><strong>S<sub>m<\/sub><\/strong> = a raz\u00e3o m\u00ednima sinal\/ru\u00eddo para os ouvintes.<\/div>\n<\/li>\n<\/ul>\n<p align=\"justify\">Quando o convidado cr\u00edtico <strong>N<sub>o<\/sub><\/strong> chega, cada pessoa que est\u00e1 falando \u00e9 for\u00e7ada a aumentar progressivamente sua pot\u00eancia ac\u00fastica (<em>e.g.<\/em>, \u201cEu realmente n\u00e3o sei o que ela viu nele\u201d \u2014 \u201cOi?\u201d \u2014 \u201cEu disse: EU REALMENTE N\u00c3O SEI PORQUE ELA SAIU COM ELE\u201d) ao mesmo tempo em que cada rodinha \u00e9 for\u00e7ada a se fechar cada vez mais a fim de manter a conversa\u00e7\u00e3o em n\u00edveis confort\u00e1veis.<\/p>\n<p align=\"justify\">\u201cPortanto, n\u00f3s verificamos que, uma vez que o n\u00famero cr\u00edtico de convidados seja excedido, a festa subitamente se torna barulhenta\u201d, concluiu MacLean. \u201cA pot\u00eancia de cada falante aumenta exponencialmente at\u00e9 o m\u00e1ximo poss\u00edvel. Depois disso, cada um reduz sua dist\u00e2ncia de conversa\u00e7\u00e3o abaixo do convencional e ent\u00e3o passa, por exemplo, a manter apenas a proximidade, o <em>t\u00eate \u00e0 t\u00eate<\/em> necess\u00e1rio para uma raz\u00e3o sinal\/ru\u00eddo suport\u00e1vel. Gra\u00e7as a esse fen\u00f4meno, a festa, mesmo que seja uma bem barulhenta, pode ser confinada no interior de um apartamento.\u201d<\/p>\n<p align=\"justify\">\u00c9 uma pena que o IgNobel ainda n\u00e3o existisse na \u00e9poca. MacLean merecia um de F\u00edsica.<\/p>\n<h3 align=\"justify\">Refer\u00eancia<\/h3>\n<p align=\"justify\"><a href=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2012\/07\/rb2_large_gray25.png\" data-rel=\"lightbox-image-0\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img decoding=\"async\" class=\"alignleft size-full wp-image-3123\" alt=\"rb2_large_gray25\" src=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2012\/07\/rb2_large_gray25.png\" width=\"70\" height=\"85\"><\/a>MACLEAN, William R., \u201cOn the Acoustics of Cocktail Parties,\u201d <em>Journal of the Acoustical Society of America<\/em>, January 1959, 79-80. [H\u00e1 um pdf dispon\u00edvel apenas para assinantes em <a title=\"http:\/\/dx.doi.org\/10.1121\/1.1907616\" href=\"http:\/\/dx.doi.org\/10.1121\/1.1907616\">http:\/\/dx.doi.org\/10.1121\/1.1907616<\/a>.]<\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Instituto Polit\u00e9cnico do Brooklyn, 1958. O engenheiro ac\u00fastico William MacLean investiga um problema important\u00edssimo, com s\u00e9rias repercurs\u00f5es sociais: Quantos convidados podem participar de uma festa antes que ela se torne barulhenta demais para manter uma conversa? McLean encontrou uma resposta e expressou-a na seguinte f\u00f3rmula: onde: No = o n\u00famero cr\u00edtico de convidados, acima do [&hellip;]<\/p>\n","protected":false},"author":486,"featured_media":4845,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_monsterinsights_skip_tracking":false,"material-hide-sections":[],"pgc_sgb_lightbox_settings":"","_vp_format_video_url":"","_vp_image_focal_point":[],"footnotes":""},"categories":[53,63,78,79,86,111,131,203],"tags":[407,692,1545],"class_list":["post-4837","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciencia","category-comunicacao","category-cultura","category-curiosidades","category-divulgacao-cientifica","category-exatas","category-fisica","category-matematica","tag-acustica","tag-balada","tag-festa"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - 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