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After three half lives, the percentage o...

After three half lives, the percentage of fraction of amount a).35 b)12.5 c)50 d)75

A

14

B

37

C

7

D

5

Text Solution

Verified by Experts

The correct Answer is:
D
The value of x
`x=(N)/(N_(0))xx100={e^(-lamda(3/(lamda)))}xx100=5%`
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DC PANDEY ENGLISH-NUCLEI-CHAPTER EXERCISES
  1. The mean lives of a radioactive substance are 1620 years and 405 years...

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  2. A rodiactive nucleus is being produced at a constant rate alpha per se...

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  3. After three half lives, the percentage of fraction of amount a).35 b)1...

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  4. The radioactivity due to C-14 isotope (half-life = 6000 years) of a sa...

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  5. Nucleus A decays into B with a decay constant lamda(1) and B further d...

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  6. Two identical samples (same material and same amout) P and Q of a radi...

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  7. An energy of 24.6 eV is required to remove one of that electrons from ...

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  8. The activity of a sample of radioactive material is A1 at time t1 an...

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  9. A heavy nucleus at rest breaks into two fragments which fly off with v...

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  10. A radioactive material decays by simultaneous emission of two particle...

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  11. Nuceli A and B convert into a stable nucleus C. Nucleus A is converted...

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  12. The half - life of a radioactive substance is 50 days. The substance w...

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  13. Starting with a sample of pure .^66 Cu, 7//8 of it decays into Zn in 1...

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  14. A stationary radioactive nucleus of mass 210 units disintegrates into ...

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  15. A bone containing 200 g carbon-14 has beta-decay rate of 375 decay/min...

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  16. If 200 MeV energy is released in the fission of a single U^(235) nucle...

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  17. The activity of a radioactive sample is measures as N0 counts per minu...

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  18. In the nuclear fusion reaction (1)^(2)H + (1)^(3)H rarr (2)^(4)He + ...

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  19. The half-life of the radioactive radon is 3.8 days. The time, at the e...

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  20. The half-life of radioactive Polonium (Po) is 138.6 days. For ten lakh...

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