{"id":477,"date":"2023-06-15T23:24:24","date_gmt":"2023-06-15T23:24:24","guid":{"rendered":"https:\/\/physigeek.com\/it\/onda-elettromagnetica\/"},"modified":"2023-06-15T23:24:24","modified_gmt":"2023-06-15T23:24:24","slug":"onda-elettromagnetica","status":"publish","type":"post","link":"https:\/\/physigeek.com\/it\/onda-elettromagnetica\/","title":{"rendered":"Onda elettromagnetica"},"content":{"rendered":"<p>Questo articolo spiega cosa sono le onde elettromagnetiche in fisica. Troverai quindi la definizione di onda elettromagnetica, le caratteristiche delle onde elettromagnetiche e quali sono i diversi tipi di onde elettromagnetiche. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-una-onda-electromagnetica\"><\/span> cos&#8217;\u00e8 un&#8217;onda elettromagnetica?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Un&#8217;onda <strong>elettromagnetica<\/strong> \u00e8 un&#8217;onda creata da un campo elettromagnetico, cio\u00e8 le onde elettromagnetiche sono generate dalle oscillazioni di un campo elettrico e di un campo magnetico.<\/p>\n<p> Pertanto, tutte le onde elettromagnetiche generate da un campo elettromagnetico sono <strong>radiazioni elettromagnetiche<\/strong> .<\/p>\n<p> In breve, quando un campo elettrico oscillante si combina con un campo magnetico oscillante, si crea un campo elettromagnetico e vengono emesse onde elettromagnetiche. <\/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 elettromagnetica\" 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> Un esempio di onda elettromagnetica \u00e8 quella delle onde radio, presenti nella vita quotidiana. Allo stesso modo, anche i raggi luminosi visibili, i raggi infrarossi e i raggi ultravioletti sono esempi di onde elettromagnetiche.<\/p>\n<p> La caratteristica principale delle onde elettromagnetiche \u00e8 che possono propagarsi nel vuoto. Pertanto, a differenza di altri tipi di onde, non necessitano di un mezzo materiale per propagarsi. La velocit\u00e0 di un&#8217;onda elettromagnetica nel vuoto \u00e8 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=\"onde elettromagnetiche\" class=\"wp-image-9803\"><\/figure>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Caracteristicas-de-las-ondas-electromagneticas\"><\/span> Caratteristiche delle onde elettromagnetiche<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Le <strong>caratteristiche delle onde elettromagnetiche<\/strong> sono:<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Allungamento (y)<\/strong> : \u00e8 la distanza tra la perturbazione dell&#8217;onda e la sua posizione di equilibrio.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Ampiezza (A)<\/strong> : \u00e8 la distanza tra la massima estensione e la sua posizione di equilibrio.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Cresta<\/strong> : ciascuno dei punti pi\u00f9 alti dell&#8217;onda.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Valle<\/strong> : ciascuno dei punti pi\u00f9 bassi dell&#8217;onda.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Ciclo o oscillazione<\/strong> : \u00e8 il percorso dell&#8217;onda da un punto al punto equivalente successivo.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Lunghezza d&#8217;onda (\u03bb)<\/strong> : \u00e8 la distanza tra due punti equivalenti consecutivi sull&#8217;onda.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Periodo (T)<\/strong> : \u00e8 il tempo necessario per compiere un&#8217;oscillazione completa.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Frequenza (f)<\/strong> : \u00e8 il numero di oscillazioni o vibrazioni che l&#8217;onda produce nell&#8217;unit\u00e0 di 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>Frequenza angolare (o pulsazione) (\u03c9)<\/strong> : \u00e8 la velocit\u00e0 con cui oscilla l&#8217;onda.<\/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>Numero d&#8217;onda (k)<\/strong> : \u00c8 definito come il numero di cicli effettuati su una lunghezza di 2\u03c0 metri.<\/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>Velocit\u00e0 di propagazione (v)<\/strong> : \u00e8 la velocit\u00e0 con cui si propaga l&#8217;onda.<\/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=\"Caratteristiche di un'onda elettromagnetica\" 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> Tipi di onde elettromagnetiche<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Le onde elettromagnetiche sono classificate in base alla loro lunghezza d&#8217;onda o frequenza d&#8217;onda, in modo che, a seconda delle caratteristiche della radiazione elettromagnetica, si tratti di un tipo di onda elettromagnetica o di un altro.<\/p>\n<p> I <strong>tipi di onde elettromagnetiche<\/strong> sono:<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Raggi gamma<\/strong> : onde elettromagnetiche con lunghezza d&#8217;onda inferiore a 0,01 nm.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Raggi X<\/strong> : onde elettromagnetiche con lunghezza d&#8217;onda compresa tra 0,01 nm e 10 nm.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Raggi ultravioletti<\/strong> : onde elettromagnetiche con lunghezza d&#8217;onda compresa tra 10 nm e 380 nm.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Raggi luminosi visibili<\/strong> : onde elettromagnetiche con lunghezza d&#8217;onda compresa tra 380 nm e 780 nm.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Raggi infrarossi<\/strong> : onde elettromagnetiche con lunghezza d&#8217;onda compresa tra 780 nm e 1 mm.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Microonde<\/strong> \u2013 Onde elettromagnetiche con una lunghezza d&#8217;onda compresa tra 1 mm e 1 m.<\/span><\/li>\n<li style=\"margin-bottom:16px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Onde radio<\/strong> : onde elettromagnetiche con lunghezza d&#8217;onda superiore a 1 m.<\/span><\/li>\n<\/ul>\n<p> Di seguito puoi vedere le bande dello spettro elettromagnetico che classificano diversi tipi di onde elettromagnetiche. <\/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 elettromagnetica<\/th>\n<th class=\"has-text-align-center\" data-align=\"center\"> Lunghezza d&#8217;onda<\/th>\n<th class=\"has-text-align-center\" data-align=\"center\"> Frequenza<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\"> Raggi gamma<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> &lt;0,01 nm<\/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\"> Raggi 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\"> Ultravioletto<\/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\"> luce visibile<\/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 THz \u2013 385 THz<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\"> Infrarossi<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 780 nm \u2013 1 mm<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 385 THz \u2013 300 GHz<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\"> Microonde<\/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\"> 300GHz \u2013 300MHz<\/td>\n<\/tr>\n<tr>\n<td class=\"has-text-align-center\" data-align=\"center\"> Radio<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 1m \u2013 10000km<\/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> Inoltre, all\u2019interno della luce visibile all\u2019occhio umano, possiamo classificare i raggi elettromagnetici in base al colore che percepiamo:<\/p>\n<figure class=\"wp-block-table aligncenter is-style-stripes\">\n<table>\n<thead>\n<tr>\n<th> Colore<\/th>\n<th class=\"has-text-align-center\" data-align=\"center\"> Lunghezza d&#8217;onda (nm)<\/th>\n<th class=\"has-text-align-center\" data-align=\"center\"> Frequenza (THz)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> viola<\/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> Blu<\/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> GIALLO<\/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> Arancia<\/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> Rosso<\/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>Questo articolo spiega cosa sono le onde elettromagnetiche in fisica. Troverai quindi la definizione di onda elettromagnetica, le caratteristiche delle onde elettromagnetiche e quali sono i diversi tipi di onde elettromagnetiche. cos&#8217;\u00e8 un&#8217;onda elettromagnetica? Un&#8217;onda elettromagnetica \u00e8 un&#8217;onda creata da un campo elettromagnetico, cio\u00e8 le onde elettromagnetiche sono generate dalle oscillazioni di un campo elettrico &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/it\/onda-elettromagnetica\/\"> <span class=\"screen-reader-text\">Onda elettromagnetica<\/span> Leggi altro &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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