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If a radioactive substance disintegrates...

If a radioactive substance disintegrates by 20% in 5d, then what part of the initial mass of the substance will remain intact after 15 d?

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CHHAYA PUBLICATION-ATOMIC NUCLEUS-EXERCISE
  1. The half-life of a radioactive element is 1600 y. What part of the ele...

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  2. The half-life of a radioactive element is 3 min. If the initial mass o...

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  3. Initial mass of a radioactive element is 1 g. If 0.25 g of the element...

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  4. The half-life of a radioactive element is 1600 y. After what time 10% ...

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  5. One-fourth part of a radioactive element is disintegrated in 664 y. De...

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  6. The half-life of U^238 is 4.5xx10^9 y. In any radioactive sample if 1...

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  7. The activity of 1 g. of a sample of Po^210 is 4442 Ci. Determine the h...

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  8. The half-life of an isotope of carbon is 6000 y. In how many years the...

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  9. The half-life of a radioactive element is 2h. If its initial mass be 5...

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  10. The half-life of Radon is 3.8 d. After how many days 1/20 part of some...

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  11. If a radioactive substance disintegrates by 20% in 5d, then what part ...

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  12. Radioactive isotope Th^232 (Z = 90) emits six alpha-particles and four...

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  13. The half-life of a radio-isotope is 3 min. What fraction of the number...

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  14. One -fourth of the amount of a radioactive element decays is 2490 yea...

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  15. The half-life of Radium-226 is 1600 years. What will be the activity o...

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  16. The activity of 1 g of Pb^210 is 77.4 curie. Find its half life. Giv...

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  17. A radioactive isotope has a half-life of T years. How long will it tak...

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  18. The nuclei P and Q have equal number of atoms at t = 0. Their half-liv...

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  19. The half-life of .92^238U undergoing alpha-decay is 4.5xx10^9 year. Wh...

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  20. The binding energies of deuterium (.1H^2) and helium (.2He^4) per nucl...

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