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The radioactivity of an element was foun...

The radioactivity of an element was found to be one millicurie. What will be its radioactivity after 42 days if its has half life of 14 days?

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OP TANDON-RADIOACTIVITY AND NUCLEAR TRANSFORMATION -Problem Practices
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  2. The activity of a radioactive isotope falls to 12.5% in 90 days. Compu...

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  3. The radioactivity of an element was found to be one millicurie. What w...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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