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Activity of a radioactive sample decreas...

Activity of a radioactive sample decreases to (1/3)rd of its original value in 3 days. Then, in 9 days its activity will become

A

`1/27`

B

`1/21`

C

`1/45`

D

`1/36`

Text Solution

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The correct Answer is:
A
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-ATOMS, MOLECULES AND NUCLEI -Exercise 1 (TOPICAL PROBLEMS)
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  2. Two radioactive materials X(1) and X(2) have decay constants 5 lambda ...

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  3. Activity of a radioactive sample decreases to (1/3)rd of its original ...

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  4. Starting with a sample of pure .^(66)Cu, 7//8 of it decays into Zn in ...

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  5. Which of the following cannot be emitted by radioactive substances dur...

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  6. The ratio of half-life times of two elements A and B is (T(A))/(T(B))....

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  7. The half-life of the isotope .(11)Na^(24), is 15h. How much time does ...

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  8. In aluminium extraction by the Baeyer's process, hv=e^(+)+e^(-) is kno...

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  9. A free neutron decays spontaneously into

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  10. In the nuclear reaction ""(7)N^(14)+X to ""(6)C^(14)+""(1)H^(2), the X...

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  11. ""(92)U^(238) on absorbing a neutron goes over to ""(92)U^(239). This ...

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  12. IF in a nuclear fission, piece of uranium of mass 5.0g is lost, the en...

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  13. The energy released by the fission of one uranium atom is 200 MeV. The...

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  14. An alpha-particlee of mass m suffers one dimensional elastic collision...

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  15. The operation of a nuclear reactor is said to be critical, if the mult...

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  16. On bombardment of U^235 by slow neutrons, 200 MeV energy is released. ...

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  17. The binding energies of the atoms of elements A and B are E(a) and E(b...

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  18. If 200 MeV of energy is released in the fission of 1 nucleus of ""(92)...

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  19. If 200 MeV energy is released in the fission of a single nucleus of .(...

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  20. When a sample of solid lithium is placed in a flask of hydrogen gas th...

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