{"id":268361,"date":"2025-07-24T04:36:18","date_gmt":"2025-07-24T04:36:18","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=268361"},"modified":"2025-07-24T04:36:20","modified_gmt":"2025-07-24T04:36:20","slug":"what-percentage-of-daughter-atoms-remain-after-2-half-lives-have-elapsed","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/24\/what-percentage-of-daughter-atoms-remain-after-2-half-lives-have-elapsed\/","title":{"rendered":"What percentage of daughter atoms remain after 2 half-lives have elapsed"},"content":{"rendered":"\n<p>What percentage of daughter atoms remain after 2 half-lives have elapsed? ? <\/p>\n\n\n\n<p>25% <\/p>\n\n\n\n<p>75%<\/p>\n\n\n\n<p>100% <\/p>\n\n\n\n<p>50%<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\">The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>The correct answer is <strong>25%<\/strong>.<\/p>\n\n\n\n<p>To explain this, half-life refers to the time it takes for half of the original amount of a radioactive substance to decay into its daughter atoms. After one half-life, 50% of the original substance will have decayed, and 50% will remain as parent atoms.<\/p>\n\n\n\n<p>After two half-lives, the amount of parent atoms will have reduced by half again, meaning only 25% of the original parent atoms remain. In contrast, 75% of the original parent atoms will have decayed into daughter atoms. Thus, after two half-lives, <strong>25% of the original parent atoms remain<\/strong>, and <strong>75% have decayed<\/strong>.<\/p>\n\n\n\n<p>To visualize this:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>After 1 half-life, 50% of the original substance decays into daughter atoms.<\/li>\n\n\n\n<li>After 2 half-lives, another 50% of the remaining parent atoms decay, leaving 25% of the original parent atoms.<\/li>\n<\/ol>\n\n\n\n<p>This process continues with each half-life halving the amount of the original substance, and therefore, increasing the amount of daughter atoms. So, after 2 half-lives, <strong>25% of the original parent atoms remain<\/strong> and <strong>75% have decayed into daughter atoms<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What percentage of daughter atoms remain after 2 half-lives have elapsed? ? 25% 75% 100% 50% The correct answer and explanation is: The correct answer is 25%. To explain this, half-life refers to the time it takes for half of the original amount of a radioactive substance to decay into its daughter atoms. After one [&hellip;]<\/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-268361","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/268361","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=268361"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/268361\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=268361"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=268361"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=268361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}