{"id":266987,"date":"2025-07-23T08:34:53","date_gmt":"2025-07-23T08:34:53","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=266987"},"modified":"2025-07-23T08:34:55","modified_gmt":"2025-07-23T08:34:55","slug":"the-fact-that-the-speed-of-light-is-constant-as-it-travels-through-a-vacuum-means-that","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/23\/the-fact-that-the-speed-of-light-is-constant-as-it-travels-through-a-vacuum-means-that\/","title":{"rendered":"The fact that the speed of light is constant as it travels through a vacuum means that"},"content":{"rendered":"\n

The fact that the speed of light is constant as it travels through a vacuum means that <\/p>\n\n\n\n

a. X-rays can be transmitted through the atmosphere around the world. <\/p>\n\n\n\n

b. radio wave photons have shorter wavelengths than gamma-ray photons. <\/p>\n\n\n\n

c. all photons have the same wavelength. <\/p>\n\n\n\n

d. photons with longer wavelengths have lower frequencies. <\/p>\n\n\n\n

e. ultraviolet photons have less energy than visible photons.<\/p>\n\n\n\n

The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n

The correct answer is d. photons with longer wavelengths have lower frequencies.<\/strong><\/p>\n\n\n\n

Explanation:<\/h3>\n\n\n\n

The speed of light in a vacuum is constant, approximately 3 x 10^8 meters per second<\/strong>. This fact is fundamental to the nature of electromagnetic waves, including light. The speed of light is related to the frequency and wavelength of the electromagnetic wave by the equation: c=\u03bb\u22c5fc = \\lambda \\cdot f<\/p>\n\n\n\n

Where:<\/p>\n\n\n\n

    \n
  • c<\/strong> is the speed of light in a vacuum,<\/li>\n\n\n\n
  • \u03bb<\/strong> (lambda) is the wavelength of the wave, and<\/li>\n\n\n\n
  • f<\/strong> is the frequency of the wave.<\/li>\n<\/ul>\n\n\n\n

    Since the speed of light is constant, the wavelength and frequency are inversely related. This means that if the wavelength of a photon increases, its frequency must decrease to maintain the constant speed of light. Therefore, photons with longer wavelengths indeed have lower frequencies.<\/p>\n\n\n\n

    Let\u2019s look at the other options:<\/p>\n\n\n\n

      \n
    • a. X-rays can be transmitted through the atmosphere around the world<\/strong>: This is incorrect. X-rays are largely absorbed by the Earth’s atmosphere and do not travel easily through it.<\/li>\n\n\n\n
    • b. Radio wave photons have shorter wavelengths than gamma-ray photons<\/strong>: This is incorrect. Radio waves have much longer wavelengths compared to gamma rays.<\/li>\n\n\n\n
    • c. All photons have the same wavelength<\/strong>: This is incorrect. Photons can have different wavelengths, depending on the type of electromagnetic radiation they represent, such as radio waves, visible light, and gamma rays.<\/li>\n\n\n\n
    • e. Ultraviolet photons have less energy than visible photons<\/strong>: This is incorrect. Ultraviolet photons have higher energy than visible photons because their wavelengths are shorter.<\/li>\n<\/ul>\n\n\n\n

      Thus, the inverse relationship between wavelength and frequency, as dictated by the constant speed of light, is best described by option d<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"

      The fact that the speed of light is constant as it travels through a vacuum means that a. X-rays can be transmitted through the atmosphere around the world. b. radio wave photons have shorter wavelengths than gamma-ray photons. c. all photons have the same wavelength. d. photons with longer wavelengths have lower frequencies. e. ultraviolet […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","ast-disable-related-posts":"","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":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-266987","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/266987","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=266987"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/266987\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=266987"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=266987"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=266987"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}