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After a certain lapse of time, fraction ...

After a certain lapse of time, fraction of radioactive polonium undecayed is found to be `12.5%` of the initial quantity. What is the duration of this time lapsed if the half life of polonium is 138 days ?

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The correct Answer is:
414 days
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SL ARORA-ATOMS, NUCLEI AND MOLECULES-Problems For Self Practice
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  2. The half-life of .(6)C^(14) is 5730 years. What fraction of a sample o...

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  3. After a certain lapse of time, fraction of radioactive polonium undeca...

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  4. The half - life of a radioactive substance is 60 years. Calculate its ...

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  5. The half life of Radon is 3.8 days. Calculate how much of 15 milligram...

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  8. The half life of polonium is 140 days. In what time will 15 g of polon...

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  9. 4g of a radioactive material of half life 10 years is kept in a store ...

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  10. One gram of radium is reduced by 2 miligram in 5 yers by alpha-decay....

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  14. An accident occurs in a laboratory in which a large amount of a radioa...

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  15. For a given sample, the count rate is 47.5alpha particle per minute. A...

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  16. One milligram of thorium emits 22alpha particles per minute per unit s...

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  18. A slow neutron strikes a nucleus of .(92)U^(235) splitting it into lig...

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  19. Calculate the Q - value of the reaction .(1)H^(2)+.(1)H^(2) rarr .(...

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