{"id":23645,"date":"2025-09-02T17:08:08","date_gmt":"2025-09-02T17:08:08","guid":{"rendered":"https:\/\/www.europesays.com\/fi\/23645\/"},"modified":"2025-09-02T17:08:08","modified_gmt":"2025-09-02T17:08:08","slug":"mita-valo-on-tieku-fi","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/fi\/23645\/","title":{"rendered":"Mit\u00e4 valo on? | tieku.fi"},"content":{"rendered":"<p>Kun valo osuu esimerkiksi metallipintaan, se voi iske\u00e4 sit\u00e4 irti elektroneja, jos taajuus on kyllin suuri.<\/p>\n<p>Jos valo olisi pelkk\u00e4 aalto, voimakkaalla aallolla pit\u00e4isi olla sama vaikutus, vaikka sen taajuus olisi pienempi. Mutta ei ole.<\/p>\n<p>Aaltoteorian mukaan energia on jakautunut aallossa tasaisesti. Valon energia on kuitenkin pienin\u00e4 paketteina, joilla on samat fyysiset ominaisuudet kuin hiukkasilla, kun valo esimerkiksi t\u00f6rm\u00e4\u00e4 atomeihin tai elektroneihin.<\/p>\n<p>Einstein p\u00e4\u00e4tteli, ett\u00e4 valo on sek\u00e4 aaltoja ett\u00e4 hiukkasia, joita h\u00e4n kutsui \u201dvalokvanteiksi\u201d.<\/p>\n<p>Nyky\u00e4\u00e4n valokvantteja sanotaan fotoneiksi ja valon luonnetta \u201daalto-hiukkasdualismiksi\u201d.<\/p>\n<p>Kun valoa havainnoidaan tai mitataan, se on aalto. Kun se vuorovaikuttaa aineen kanssa, se on hiukkasia.<\/p>\n","protected":false},"excerpt":{"rendered":"Kun valo osuu esimerkiksi metallipintaan, se voi iske\u00e4 sit\u00e4 irti elektroneja, jos taajuus on kyllin suuri. Jos valo&hellip;\n","protected":false},"author":2,"featured_media":23646,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[115],"tags":[33,31,30,455,454,118,32,119],"class_list":{"0":"post-23645","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-fysiikka","8":"tag-fi","9":"tag-finland","10":"tag-finnish","11":"tag-fysiikka","12":"tag-physics","13":"tag-science","14":"tag-suomi","15":"tag-tiede"},"share_on_mastodon":{"url":"","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/posts\/23645","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/comments?post=23645"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/posts\/23645\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/media\/23646"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/media?parent=23645"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/categories?post=23645"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/tags?post=23645"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}