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A radioactive sample has a half life of 5.0 mins. what fraction of the sample is left after 20 mins. |
Answer» <html><body><p><strong>Answer:</strong></p><p>The <a href="https://interviewquestions.tuteehub.com/tag/general-471730" style="font-weight:bold;" target="_blank" title="Click to know more about GENERAL">GENERAL</a> formula for this <a href="https://interviewquestions.tuteehub.com/tag/problem-25530" style="font-weight:bold;" target="_blank" title="Click to know more about PROBLEM">PROBLEM</a> is:</p><p></p><p>%left = (1/2)^(<a href="https://interviewquestions.tuteehub.com/tag/time-19467" style="font-weight:bold;" target="_blank" title="Click to know more about TIME">TIME</a> <a href="https://interviewquestions.tuteehub.com/tag/past-1148648" style="font-weight:bold;" target="_blank" title="Click to know more about PAST">PAST</a> / half-life)</p><p></p><p>In this case, %left = (1/2)^(20/5) = 0.5^4 = 0.0625 = 1/16</p><p></p><p>Consider 18 minutes:</p><p></p><p>%left = (1/2)^(18/5) = 0.5^3.6 = 0.0825</p><p><strong>Explanation:</strong></p><p></p></body></html> | |