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Radioactive elements decays at such a ra...

Radioactive elements decays at such a rate that after 68 minutes only one-fourth of its original amount remains. Calculate its decay constant and half life period.

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OP TANDON-RADIOACTIVITY AND NUCLEAR TRANSFORMATION -Problem Practices
  1. The radioactivity of an element was found to be one millicurie. What w...

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

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  3. Radioactive elements decays at such a rate that after 68 minutes only ...

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  4. One gram of a radioactive element decays by beta-emission to 0.125 in ...

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  5. A wooden article found in a cave has only 40% as much .^(34)C activity...

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  6. One mu g of a radioactive iodine contained in thyroxine is injected in...

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

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  8. The activity of a radioactivity substance fall to 87.5% of the initial...

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  9. Starting with 1.0g of a radioactive sample, 0.25 g fo its is left afte...

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  10. A sample of wooden artifact is found to undergo 9 disintegration per m...

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  11. Xenon-127 has a half life of 36.4 days. How much of a sample of xenon ...

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  12. Calculate the ratio of (N)/(N(0)) after n hour has passed for a radioa...

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  13. The activity of the hair of an Egyptian mummy is 7 disintegration "min...

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  14. On analysis a sample of .^(238)U ore was found to contain 20.6g of .(8...

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  15. It is known that 1g of .^(226)Ra emits 11.6 xx 10^(17) atoms of alpha ...

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  16. A uranium mineral contains .^(238)U and .^(206)Pb in the ratio of 4 : ...

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  17. In a sample of pitchbende, the atomic ratio of .^(206)Pb : .^(238)U i...

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  18. The ratio of the atoms of two elements A and B at radioactive equilibr...

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  19. Calculate the energy released in MeV during the reaction .(3)^(7)Li + ...

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  20. The half life period of .(58)^(141)Ce is 13.11 days. It is a beta-part...

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