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The half-life of a radiaoactive substan...

The half-life of a radiaoactive substance is 100 years. In how many years its activity will deacy to 10% of its initial value?

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MODERN PUBLICATION-Radioactivity-EXERCISE
  1. The atomic weiht of radium is 226 .It is observed that 3.67 xx 10^(10)...

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  2. Tha half-life of U^(238) against alpha decays is 1.42 xx 10^(17)s.How ...

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  3. 4 g of radioactive material of half-life 10 years is kept in a store f...

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  4. One gram radium is reduced by 2 milligram in 5 years by alpha-decay. C...

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  5. The half-life of a radioactive substance is 1,672 years. If the initia...

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  6. The half-life of a radiaoactive substance is 100 years. In how many y...

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  7. The half-life of a radiaoactive substance is 100 years. In how many y...

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  8. A nucleus of UX1 has a half - life of 24.1 days.How long a sampleUX1 w...

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  9. Radioactive disintegration is a first order reaction and its rate depe...

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  10. If the activity of a radiacctive element drops to frac(1)(16)th of its...

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  11. The half-life of a radiaoactive substance is 100 years. In how many y...

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  12. The half-life of a radiaoactive substance is 100 years. In how many y...

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  13. The half-life of a radiaoactive substance is 100 years. In how many y...

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  14. The half-life of a radiaoactive substance is 100 years. In how many y...

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  15. One gram of (88) Ra^(226) has activity of one curie .Find its half-li...

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  16. Obtain the amount of "27^60Co necessary to provide a radioactive sourc...

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  17. The count rate from a radiuactive sample falls from 4.0 xx 10^6 s^(-1)...

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  18. A radioactive sample can decay by two different processes .The half-li...

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  19. 1 mg of thorium emits 22 alpha- particles per minute per unit solid an...

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  20. A point source of gamma- radiatonhas a half-life of 30 minutes.The int...

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