{"id":321,"date":"2023-06-21T18:08:41","date_gmt":"2023-06-21T18:08:41","guid":{"rendered":"https:\/\/physigeek.com\/pt\/frequencia\/"},"modified":"2023-06-21T18:08:41","modified_gmt":"2023-06-21T18:08:41","slug":"frequencia","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/frequencia\/","title":{"rendered":"Frequ\u00eancia"},"content":{"rendered":"<p>Este artigo explica o que \u00e9 frequ\u00eancia na f\u00edsica. Voc\u00ea descobrir\u00e1, portanto, o que significa frequ\u00eancia na f\u00edsica, as unidades de frequ\u00eancia e para que serve essa quantidade f\u00edsica. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-la-frecuencia\"><\/span> O que \u00e9 frequ\u00eancia?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>Frequ\u00eancia<\/strong> \u00e9 uma quantidade f\u00edsica que mede o n\u00famero de repeti\u00e7\u00f5es de um evento peri\u00f3dico por unidade de tempo. Em outras palavras, a frequ\u00eancia indica quantas vezes um evento se repete em um determinado tempo.<\/p>\n<p> Por exemplo, se uma onda se repete cinco vezes por segundo, isso significa que a frequ\u00eancia dessa onda \u00e9 de cinco ciclos por segundo. A onda, portanto, tem uma frequ\u00eancia de 5 Hz (hertz). Abaixo veremos quais s\u00e3o as unidades de frequ\u00eancia.<\/p>\n<p> Para calcular a frequ\u00eancia de um fen\u00f4meno f\u00edsico, define-se um intervalo de tempo e conta-se o n\u00famero de vezes que o fen\u00f4meno ocorre nesse intervalo. A frequ\u00eancia desse fen\u00f4meno \u00e9 ent\u00e3o igual ao n\u00famero de vezes que ele se repetiu dividido pelo intervalo de tempo estudado.<\/p>\n<p> Por outro lado, a frequ\u00eancia estat\u00edstica, chamada frequ\u00eancia absoluta, \u00e9 o n\u00famero de vezes que um evento se repete em uma amostra. Para saber mais, recomendamos que visite nosso site especializado em estat\u00edstica <em><u style=\"text-decoration-color:#4fd12f\">www.probabilityestadistica.net<\/u><\/em> .<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Unidades-de-frecuencia\"><\/span> Unidades de frequ\u00eancia<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>A unidade de frequ\u00eancia no Sistema Internacional (SI) \u00e9 o hertz (ou hertz), cujo s\u00edmbolo \u00e9 Hz.<\/strong> O hertz \u00e9 uma unidade de frequ\u00eancia que indica o n\u00famero de repeti\u00e7\u00f5es que um fen\u00f4meno f\u00edsico ocorre em um segundo.<\/p>\n<p> Mais precisamente, um hertz \u00e9 igual a 1\/s. Assim, uma frequ\u00eancia de um hertz significa que o fen\u00f4meno f\u00edsico estudado se repetiu apenas uma vez por segundo. Da mesma forma, uma frequ\u00eancia de 7 hertz significa que foi repetida sete vezes em um segundo.<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-7ff2c48a3f90eeee2005b298e85760ce_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"7 \\ Hz = 7 \\ \\cfrac{\\text{r\u00e9p\u00e9titions}}{\\text{seconde}}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"163\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> O nome hertz foi dado \u00e0 principal unidade de frequ\u00eancia em homenagem ao f\u00edsico alem\u00e3o Heinrich Rudolf Hertz, por ter descoberto a propaga\u00e7\u00e3o das ondas eletromagn\u00e9ticas. Este nome foi adotado na Confer\u00eancia Geral de Pesos e Medidas (CGPM) de 1960, substituindo o <em>ciclo anterior de nomes pelo segundo<\/em> .<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ejemplos-de-frecuencias\"><\/span> Exemplos de frequ\u00eancia<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Agora que sabemos a defini\u00e7\u00e3o de frequ\u00eancia e qual \u00e9 a sua unidade no Sistema Internacional, vejamos v\u00e1rios exemplos de frequ\u00eancias do dia a dia para compreender completamente o conceito.<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:20px\"> <span style=\"color:#101010;font-weight: normal;\">Por exemplo, a transi\u00e7\u00e3o do dia para a noite se repete uma vez a cada 24 horas, ou seja, tem frequ\u00eancia de aproximadamente 10 <sup>-5<\/sup> Hz.<\/span><\/li>\n<li style=\"margin-bottom:20px\"> <span style=\"color:#101010;font-weight: normal;\">Quando o corpo humano est\u00e1 em repouso, o cora\u00e7\u00e3o bate numa frequ\u00eancia entre 0,83 Hz e 1,5 Hz.<\/span><\/li>\n<li style=\"margin-bottom:20px\"> <span style=\"color:#101010;font-weight: normal;\">A frequ\u00eancia respirat\u00f3ria de um ser humano \u00e9 de aproximadamente 12 a 50 respira\u00e7\u00f5es por minuto, ou o que equivale a 0,2 a 0,83 Hz. Embora isso dependa logicamente da idade e das condi\u00e7\u00f5es f\u00edsicas da pessoa.<\/span><\/li>\n<li style=\"margin-bottom:20px\"> <span style=\"color:#101010;font-weight: normal;\">Em geral, o ouvido humano s\u00f3 consegue ouvir ondas sonoras com frequ\u00eancias entre 20 Hz e 20.000 Hz.<\/span><\/li>\n<li style=\"margin-bottom:20px\"> <span style=\"color:#101010;font-weight: normal;\">Na m\u00fasica, o tom padr\u00e3o tem frequ\u00eancia de 440 Hz.<\/span> <\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frecuencia-de-ondas-electromagneticas\"><\/span> Frequ\u00eancia de ondas eletromagn\u00e9ticas<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> As ondas eletromagn\u00e9ticas s\u00e3o classificadas de acordo com sua frequ\u00eancia e comprimento de onda. Apresentamos, portanto, a seguir os diferentes tipos de radia\u00e7\u00e3o eletromagn\u00e9tica, bem como suas caracter\u00edsticas. <\/p>\n<figure class=\"wp-block-table is-style-stripes\">\n<table>\n<thead>\n<tr>\n<th class=\"has-text-align-left\" data-align=\"left\"> nome<\/th>\n<th class=\"has-text-align-center\" data-align=\"center\"> Comprimento de onda<\/th>\n<th class=\"has-text-align-center\" data-align=\"center\"> Frequ\u00eancia<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"has-text-align-left\" data-align=\"left\"> Raios gama<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> &lt;0,01nm<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> &gt; 30 Hz<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-left\" data-align=\"left\"> raios X<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,01 nm \u2013 10 nm<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 30Hz \u2013 30PH<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-left\" data-align=\"left\"> Ultravioleta<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 10nm \u2013 400nm<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 30PH \u2013 790THz<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-left\" data-align=\"left\"> luz vis\u00edvel<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 400nm \u2013 700nm<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 790 GHz \u2013 430 GHz<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-left\" data-align=\"left\"> Infravermelho<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 700nm \u2013 1mm<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 430 GHz \u2013 300 GHz<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-left\" data-align=\"left\"> Microondas<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 1mm \u2013 1m<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 300 GHz \u2013 300 MHz<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-left\" data-align=\"left\"> R\u00e1dio<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 1m \u2013 10.000km<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 300 MHz \u2013 30 Hz <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frecuencia-y-periodo\"><\/span>Frequ\u00eancia e per\u00edodo<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Por fim, veremos qual \u00e9 a diferen\u00e7a entre frequ\u00eancia e per\u00edodo na f\u00edsica e qual a rela\u00e7\u00e3o entre esses dois conceitos f\u00edsicos.<\/p>\n<p> O <strong>per\u00edodo<\/strong> \u00e9 o tempo entre a ocorr\u00eancia de um evento peri\u00f3dico e o momento em que ocorre novamente.<\/p>\n<p> Na f\u00edsica, a <strong>diferen\u00e7a entre frequ\u00eancia e per\u00edodo<\/strong> \u00e9 que frequ\u00eancia \u00e9 o n\u00famero de vezes que um evento peri\u00f3dico ocorre em um determinado momento, enquanto per\u00edodo \u00e9 o tempo entre duas ocorr\u00eancias sucessivas do evento.<\/p>\n<p> Portanto, a rela\u00e7\u00e3o entre frequ\u00eancia e per\u00edodo \u00e9 inversa, de modo que quando o per\u00edodo aumenta, a frequ\u00eancia diminui e por outro lado, quando o per\u00edodo diminui, a frequ\u00eancia aumenta. Ent\u00e3o, matematicamente, a frequ\u00eancia \u00e9 igual a um durante o per\u00edodo.<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-531bea341cf9b96ec2c355cc9e57d511_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f=\\cfrac{1}{T}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"49\" style=\"vertical-align: -12px;\"><\/p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que \u00e9 frequ\u00eancia na f\u00edsica. Voc\u00ea descobrir\u00e1, portanto, o que significa frequ\u00eancia na f\u00edsica, as unidades de frequ\u00eancia e para que serve essa quantidade f\u00edsica. O que \u00e9 frequ\u00eancia? Frequ\u00eancia \u00e9 uma quantidade f\u00edsica que mede o n\u00famero de repeti\u00e7\u00f5es de um evento peri\u00f3dico por unidade de tempo. Em outras palavras, &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/frequencia\/\"> <span class=\"screen-reader-text\">Frequ\u00eancia<\/span> Leia mais &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","footnotes":""},"categories":[4],"tags":[],"class_list":["post-321","post","type-post","status-publish","format-standard","hentry","category-conceitos"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u25b7 O que \u00e9 frequ\u00eancia? 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