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The half -life of polonium is 138 days a...

The half -life of polonium is 138 days against alpha decay . What fraction of a sample of pure polonium will remain undecayed after 276 days ?

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The correct Answer is:
`(1)/(4)`
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SL ARORA-ATOMS, NUCLEI AND MOLECULES-Problems For Self Practice
  1. Thorium .(90)Th^(232) is converted into .(89)Pb^(208) by radioactive t...

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  2. Tritium has a half life of 12.5 years against beta decay. What fractio...

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  3. The half -life of polonium is 138 days against alpha decay . What frac...

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  4. The half-life of .(6)C^(14) is 5730 years. What fraction of a sample o...

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

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

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

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  8. The life-life of Bi^210 is 5 days. What time is taken by (7//8)^th par...

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  9. A sample of a radioactive substance has 10^(6) radioactive nuclei. Its...

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

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  11. 4g of a radioactive material of half life 10 years is kept in a store ...

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

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  13. A nucleus of Ux(1) has a life of 24.1 days. How long a sample of Ux(2)...

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  14. The half - life of .(92)U^(238) against alpha - decay is 4.5 xx 10^(9)...

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  15. Lanthanum has a stable La^(139) and radioactive isotope La^(138) of ha...

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

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

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

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  19. The half life of .(90)Th^(225) is 8 minutes How many half lives are th...

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

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