GK
NUCLEAR SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The time taken for a radioactive element to reduce to 50 % of its original weight is ____ years, if its half life period is 12 years.
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6
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18
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24
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48
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Explanation:
Detailed explanation-1: -The time taken for a radioactive element to reduce to 50% of its original weight is years if its half-life period is 12 years. Explanation: As per the radioactive decay rule, the required time will be 18 years.
Detailed explanation-2: -The correct option is (b) 100 hrs.
Detailed explanation-3: -Hint: To calculate the radioactive decay, the equation used is N(t)=N∘e−t where N is the radioactive nuclei present at time t and N∘ is the number of radioactive nuclei present initially. The half-life of the first-order reaction is calculated by dividing 0.693 to radioactive decay constant.
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