A radioactive isotope has a half life of 2 minutes. What can be declared from this statement?
Correct answer: C. After 4 minute, 1/4 of the isotope remain
- A. After 1/2 minutes, 1/4 of the isotope remain
- B. After 1 minute, 1/4 of the isotope remain
- C. After 4 minute, 1/4 of the isotope remain
- D. After 4 minute, none of the isotope remain
Explanation
As the Half life is 2 min and the original qunatity of isotopes is 1/2 when we double the time then multiply the half of the new time time we get remaining isotopesIn this question1st half life = 1/2 of the original isotopes2nd half life (4 minutes) = 1/2 x 1/2 of the origial isotopes
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About Half-life and Rate of Decay
Half-life is the time required for half the unstable nuclei in a sample to decay, and it remains constant for a particular radioactive nuclide. Questions use the exponential decay law, decay constant, activity, remaining quantity and mean life. Radioactive decay is random for individual nuclei but predictable for large samples.
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