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In a mean life of a radioactive sample...

In a mean life of a radioactive sample

A

about `2//3` of substance disintefrates

B

about `2//3` of substanced disintegrates

C

about `90%` of the substance disintegrates

D

almost all the substance disintegrates

Text Solution

Verified by Experts

The correct Answer is:
B
`63%` or nearly `2//3`
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ALLEN -SIMPLE HARMONIC MOTION-Exercise-01
  1. The constant 'a' Mosely's law sqrt(v) - a(Z-b) for k(alpha)X-rays is r...

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  2. Characteristic X-rays are not obtained in the spectrum of H-atom becau...

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  3. For the decay of nucleus, the possible reason which is not true

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  4. Assuming that 200MeV of energy is released per fission of uranium ato,...

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  5. If the binding energy per nucleon in .(3)Li^(7) and .(2)He^(4) nuclei ...

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  6. The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u= ato...

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  7. The binding energy of deuteron is 2.2 MeV and that of .(2)^(4)He is 28...

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  8. In an alpha -decay, the kinetic energy of alpha-particles is 48 MeV a...

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  9. When a neutron is disintegrated, it gas :-

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  10. If N(t) = N(o)e^(lambdat) then number of disintefrated atoms between t...

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  11. A radioactive element has half-life period of 30 days. How much of it ...

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  12. The half life of a radioactive element is 10 days, if the mass of the ...

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  13. In a mean life of a radioactive sample

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  14. Atomic weight of a radioactive element is M(W) gm. Radioactivity of m ...

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  15. Radioactive element decays to form a stable nuclide, then the rate of ...

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  16. The probability of nucleus to decay in two mean lives is

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  17. A sample of radioactive material decays simultaneouly by two processes...

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  18. Find the Q - value for the nuclear reaction: .(2)He^(4)+.(7)N^(14) r...

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

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  20. Consider the following energies :- 1. minimum energy needed to excit...

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