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A sample of uranium is a mixture of thre...

A sample of uranium is a mixture of three isotopes `._(92)U^(234), ._(92)U^(235)` and `._(92)U^(238)` present in the ratio `0.006%, 0.71%` and `99.284%` respectively. The half lives of then isotopes are `2.5xx10^(5)` years, `7.1xx10^(8)` years and `4.5xx10^(9)` years respectively. The contribution to activity (in `%`) of each isotope in the sample respectively

A

10.4

B

20.4

C

21.4

D

22.4

Text Solution

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The correct Answer is:
C
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RESNICK AND HALLIDAY-THE NUCLEUS-PRACTICE QUESTIONS (Single Correct Choice Type)
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  2. A radioactive sample has half-life of 5 years. Probability of decay in...

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  3. A sample of uranium is a mixture of three isotopes .(92)U^(234), .(92)...

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  4. At time t=0 , number of nuclei of a radioactive substance are 100. At ...

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  5. The decay constant of a radioactive sample is 1. The half life and mea...

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  6. A nucleus with Z=92 emits the following in a sequence alpha, alpha, be...

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  7. The atomic mass of B^(10) is 10.811 amu . Find the binding energy of B...

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  8. Four vessels A,B,C and D respectively, contains 20 g atom (T(1//2=5h),...

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  9. In Rutherford's famous gold foil scatterig experiment he found that mo...

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  10. The electron, neutron, and proton, listed in descending order of mass ...

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  11. Which of the following is a wrong description of binding energy of a n...

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

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  13. How does the rest energy of a nucleus compare to the sum of the rest e...

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  14. The binding energies of the nuclei of .2^4 He, .3^7 Li, .6^12 C and .7...

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  15. In the nuclear reaction descried by the equation below, an alpha parti...

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  16. Nucleus A is converted into C through the following reactions, ArarrB...

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  17. In one average life (assuming the decay to proceed according to radioa...

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  18. 90% of the active nuclei present in a radioactive sample are found to ...

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  19. Let T be the mean life of a radioactive sample. 75% of the active nucl...

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  20. A freshly prepared radioactive source of half-life 2 h emits radiation...

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