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A mixture consists of two radioactive ma...

A mixture consists of two radioactive materials `A_1` and `A_2` with half-lives of `20 s` and `10 s` respectively. Initially the mixture has `40 g` of `A_1` and `160 g` of `a_2`. The amount the two in the mixture will become equal after

A

`60 s`

B

`80 s`

C

`20 s`

D

`40 s`

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The correct Answer is:
D
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NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)-NUCLEAR PHYSICS-Exercise
  1. The half-life of a radioactive isotope X is 20 yr. It decays to anothe...

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  2. A certain mass of hydrogen is changed to helium by the process of fusi...

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  3. A mixture consists of two radioactive materials A1 and A2 with half-li...

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  4. A radioactive nucleus of mass M emits a photon of frequency v and the ...

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  5. The half-life of a radioactive isotope X is 50 yr. It decays to nother...

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  6. Fusion reaction takes place at high temperature because

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  7. A nucleus ""n^ m X emits one alpha-particle and two beta-particles. Th...

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  8. The mass of a ""(3)^(7) Li nucleus is 0.042 u less than the sum of the...

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

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  10. The number of beta particles emitter by radioactive sustance is twice ...

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  11. In the nuclear decay given below ""Z^A X rarr ""(Z-1)^A Y rarr ""(Z-...

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  12. Two radioactive materials X(1) and X(2) have decay constants 5 lambda ...

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  13. Two radioactive substance A and B have decay constants 5 lambda and la...

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  14. If radius of the ""(13)^(27)Al nucleus is estimated to be 3.6 Fermi, t...

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  15. A nucleus ""(Z)^(A)X has mass represented by m(A, Z). If m(p) and m(n)...

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  16. In radioactive decay process, the negatively changed emitted beta-part...

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  17. The radius of germanium (Ge) nuclide is measured to be twice the radiu...

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  18. In a radioactive material the activity at time t(1) is R(1) and at a l...

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

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  20. In any fission the ratio ("mass of fission produts")/("mass of paren...

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