{"id":477,"date":"2023-06-15T23:24:24","date_gmt":"2023-06-15T23:24:24","guid":{"rendered":"https:\/\/physigeek.com\/pt\/onda-eletromagnetica\/"},"modified":"2023-06-15T23:24:24","modified_gmt":"2023-06-15T23:24:24","slug":"onda-eletromagnetica","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/onda-eletromagnetica\/","title":{"rendered":"Onda eletromagn\u00e9tica"},"content":{"rendered":"<p>Este artigo explica o que s\u00e3o ondas eletromagn\u00e9ticas na f\u00edsica. Assim, voc\u00ea encontrar\u00e1 a defini\u00e7\u00e3o de onda eletromagn\u00e9tica, as caracter\u00edsticas das ondas eletromagn\u00e9ticas e quais s\u00e3o os diferentes tipos de ondas eletromagn\u00e9ticas. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-una-onda-electromagnetica\"><\/span> o que \u00e9 uma onda eletromagn\u00e9tica?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Uma <strong>onda eletromagn\u00e9tica<\/strong> \u00e9 uma onda criada por um campo eletromagn\u00e9tico, ou seja, as ondas eletromagn\u00e9ticas s\u00e3o geradas pelas oscila\u00e7\u00f5es de um campo el\u00e9trico e de um campo magn\u00e9tico.<\/p>\n<p> Assim, todas as ondas eletromagn\u00e9ticas geradas por um campo eletromagn\u00e9tico s\u00e3o <strong>radia\u00e7\u00f5es eletromagn\u00e9ticas<\/strong> .<\/p>\n<p> Em suma, quando um campo el\u00e9ctrico oscilante \u00e9 combinado com um campo magn\u00e9tico oscilante, um campo electromagn\u00e9tico \u00e9 criado e ondas electromagn\u00e9ticas s\u00e3o emitidas. <\/p>\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"530\" height=\"283\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/onde-electromagnetique.png\" alt=\"onda eletromagn\u00e9tica\" class=\"wp-image-9802\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/onde-electromagnetique-300x160.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/onde-electromagnetique.png 530w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<p> Um exemplo de onda eletromagn\u00e9tica s\u00e3o as ondas de r\u00e1dio, presentes no dia a dia. Da mesma forma, os raios de luz vis\u00edvel, os raios infravermelhos e os raios ultravioleta tamb\u00e9m s\u00e3o exemplos de ondas eletromagn\u00e9ticas.<\/p>\n<p> A principal caracter\u00edstica das ondas eletromagn\u00e9ticas \u00e9 que elas podem se propagar no v\u00e1cuo. Portanto, diferentemente de outros tipos de ondas, elas n\u00e3o necessitam de um meio material para se propagarem. A velocidade de uma onda eletromagn\u00e9tica no v\u00e1cuo \u00e9 3\u00b710 <sup>8<\/sup> m\/s. <\/p>\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"400\" height=\"333\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/ondes-electromagnetiques.gif\" alt=\"ondas eletromagn\u00e9ticas\" class=\"wp-image-9803\"><\/figure>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Caracteristicas-de-las-ondas-electromagneticas\"><\/span> Caracter\u00edsticas das ondas eletromagn\u00e9ticas<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> As <strong>caracter\u00edsticas das ondas eletromagn\u00e9ticas<\/strong> s\u00e3o:<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Alongamento (y)<\/strong> : \u00e9 a dist\u00e2ncia entre a perturba\u00e7\u00e3o da onda e sua posi\u00e7\u00e3o de equil\u00edbrio.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Amplitude (A)<\/strong> : \u00e9 a dist\u00e2ncia entre a extens\u00e3o m\u00e1xima e sua posi\u00e7\u00e3o de equil\u00edbrio.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Crista<\/strong> : cada um dos pontos mais altos da onda.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Vale<\/strong> : cada um dos pontos mais baixos da onda.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Ciclo ou oscila\u00e7\u00e3o<\/strong> : \u00e9 o caminho da onda de um ponto ao pr\u00f3ximo ponto equivalente.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Comprimento de onda (\u03bb)<\/strong> : \u00e9 a dist\u00e2ncia entre dois pontos equivalentes consecutivos na onda.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Per\u00edodo (T)<\/strong> : \u00e9 o tempo necess\u00e1rio para completar uma oscila\u00e7\u00e3o completa.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Frequ\u00eancia (f)<\/strong> : \u00e9 o n\u00famero de oscila\u00e7\u00f5es ou vibra\u00e7\u00f5es que a onda produz por unidade de tempo.<\/span><\/li>\n<p style=\"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>\n<\/p>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Frequ\u00eancia angular (ou pulsa\u00e7\u00e3o) (\u03c9)<\/strong> : \u00e9 a velocidade com que a onda oscila.<\/span><\/li>\n<p style=\"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-df8b803de06998e6a4ef5082a65705b7_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\omega=\\cfrac{2\\cdot \\pi}{T}=2\\cdot \\pi \\cdot f\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"149\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>N\u00famero de onda (k)<\/strong> : \u00c9 definido como o n\u00famero de ciclos realizados ao longo de um comprimento de 2\u03c0 metros.<\/span><\/li>\n<p style=\"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-20c1803a9dcde209173b7c67b98b2251_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"k=\\cfrac{2\\cdot \\pi}{\\lambda}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"68\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Velocidade de propaga\u00e7\u00e3o (v)<\/strong> : \u00e9 a velocidade com que a onda se propaga.<\/span> <\/li>\n<p style=\"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-85a8e2ee07d189b4d6fb7a95d6ee598c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"v=\\cfrac{\\lambda}{T}=\\cfrac{\\omega}{k}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"85\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<\/ul>\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/caracteristiques-des-ondes-transversales.png\" alt=\"caracter\u00edsticas de uma onda eletromagn\u00e9tica\" class=\"wp-image-9217\" width=\"717\" height=\"369\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/caracteristiques-des-ondes-transversales-300x155.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/caracteristiques-des-ondes-transversales-1024x528.png 1024w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/caracteristiques-des-ondes-transversales-768x396.png 768w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/caracteristiques-des-ondes-transversales.png 1368w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tipos-de-ondas-electromagneticas\"><\/span> Tipos de ondas eletromagn\u00e9ticas<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> As ondas eletromagn\u00e9ticas s\u00e3o classificadas de acordo com seu comprimento de onda ou frequ\u00eancia de onda, de forma que dependendo das caracter\u00edsticas da radia\u00e7\u00e3o eletromagn\u00e9tica, \u00e9 um tipo de onda eletromagn\u00e9tica ou outro.<\/p>\n<p> Os <strong>tipos de ondas eletromagn\u00e9ticas<\/strong> s\u00e3o:<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Raios gama<\/strong> : ondas eletromagn\u00e9ticas com comprimento de onda inferior a 0,01 nm.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Raios X<\/strong> : ondas eletromagn\u00e9ticas com comprimento de onda entre 0,01 nm e 10 nm.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Raios ultravioleta<\/strong> : ondas eletromagn\u00e9ticas com comprimento de onda entre 10 nm e 380 nm.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Raios de luz vis\u00edveis<\/strong> : ondas eletromagn\u00e9ticas com comprimento de onda entre 380 nm e 780 nm.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Raios infravermelhos<\/strong> : ondas eletromagn\u00e9ticas com comprimento de onda entre 780 nm e 1 mm.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Microondas<\/strong> \u2013 Ondas eletromagn\u00e9ticas com comprimento de onda entre 1 mm e 1 m.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Ondas de r\u00e1dio<\/strong> : ondas eletromagn\u00e9ticas com comprimento de onda superior a 1 m.<\/span><\/li>\n<\/ul>\n<p> Abaixo voc\u00ea pode ver as bandas do espectro eletromagn\u00e9tico que classificam os diferentes tipos de ondas eletromagn\u00e9ticas. <\/p>\n<figure class=\"wp-block-table is-style-stripes\">\n<table>\n<thead>\n<tr>\n<th class=\"has-text-align-center\" data-align=\"center\"> onda eletromagn\u00e9tica<\/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-center\" data-align=\"center\"> 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; 30Hz<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\"> 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-center\" data-align=\"center\"> Ultravioleta<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 10nm \u2013 380nm<\/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-center\" data-align=\"center\"> luz vis\u00edvel<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 380nm \u2013 780nm<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 790 GHz \u2013 385 GHz<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\"> Infravermelho<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 780nm \u2013 1mm<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 385 GHz \u2013 300 GHz<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\"> 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-center\" data-align=\"center\"> 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<p> Al\u00e9m disso, dentro da luz vis\u00edvel ao olho humano, podemos classificar os raios eletromagn\u00e9ticos de acordo com a cor que percebemos:<\/p>\n<figure class=\"wp-block-table aligncenter is-style-stripes\">\n<table>\n<thead>\n<tr>\n<th> Cor<\/th>\n<th class=\"has-text-align-center\" data-align=\"center\"> Comprimento de onda (nm)<\/th>\n<th class=\"has-text-align-center\" data-align=\"center\"> Frequ\u00eancia (THz)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> roxo<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 380 \u2013 450<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 670 \u2013 790<\/td>\n<\/tr>\n<tr>\n<td> Azul<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 450 \u2013 485<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 620 \u2013 670<\/td>\n<\/tr>\n<tr>\n<td> ciano<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 485 \u2013 500<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 600 \u2013 620<\/td>\n<\/tr>\n<tr>\n<td> Verde<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 500 \u2013 565<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 530 \u2013 600<\/td>\n<\/tr>\n<tr>\n<td> AMARELO<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 565 \u2013 590<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 510 \u2013 530<\/td>\n<\/tr>\n<tr>\n<td> Laranja<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 590 \u2013 625<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 480 \u2013 510<\/td>\n<\/tr>\n<tr>\n<td> Vermelho<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 625 \u2013 780<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 385 \u2013 480<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que s\u00e3o ondas eletromagn\u00e9ticas na f\u00edsica. Assim, voc\u00ea encontrar\u00e1 a defini\u00e7\u00e3o de onda eletromagn\u00e9tica, as caracter\u00edsticas das ondas eletromagn\u00e9ticas e quais s\u00e3o os diferentes tipos de ondas eletromagn\u00e9ticas. o que \u00e9 uma onda eletromagn\u00e9tica? Uma onda eletromagn\u00e9tica \u00e9 uma onda criada por um campo eletromagn\u00e9tico, ou seja, as ondas eletromagn\u00e9ticas s\u00e3o &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/onda-eletromagnetica\/\"> <span class=\"screen-reader-text\">Onda eletromagn\u00e9tica<\/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":[3],"tags":[],"class_list":["post-477","post","type-post","status-publish","format-standard","hentry","category-cinematografico"],"yoast_head":"<!-- This site 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