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The activity of a radioactivity substanc...

The activity of a radioactivity substance fall to 87.5% of the initial value in 5 years. What is the half life of the elements?
calculate the time in which the activity will fall by 87.5%.

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OP TANDON-RADIOACTIVITY AND NUCLEAR TRANSFORMATION -Problem Practices
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  5. Starting with 1.0g of a radioactive sample, 0.25 g fo its is left afte...

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

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

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

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

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

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

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

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  17. A sample of .(38)^(90)Sr has an activity of 0.5 mCi. What is its speci...

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  18. The disintegrationn rate of a certain radioactive sample at any instan...

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  19. One of the hazards of nuclear explosion is the generation of .^(90)Sr ...

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  20. To which radioactive families do the following nuclides belong? .^(2...

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