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A freshly prepared radioactive source of...

A freshly prepared radioactive source of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be passible to work safely with this source is

A

6 Hrs

B

12 Hrs

C

24 Hrs

D

128 Hrs

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-NUCLEI-Exercise-II
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  2. Two radioactive materials X1 and X2 contain same number of nuclei. I...

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  3. In order to dcrease radioactive nuclei to one million of its initial n...

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  4. The half life of radium is 1600 years. The mean life of radium is

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  5. The activity of a radioactive element decreased to one - third of orig...

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  6. The half-life of a radioactive substance is 100 years, Calculate in ho...

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  7. The counting rate observed from a radioactive source at t=0 second was...

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  8. Two nuclei P, Q have equal no.of atoms at t= 0. Their half-life are 3 ...

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  9. The sample of a radioactive substance has 10^6 nucei. Its half life is...

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  10. One mole of radium has an activity of 1/3.7 kilo curie. Its decay cons...

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  11. A radioactive nucleus undergoes a series of decays according to the se...

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  12. Tritium has a half-life of 12.5 y undergoing beta decay. What fraction...

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

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  14. If 10% of a radioactive material decays in 5 days, then the amount of ...

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  15. A certain radioactive substance has a half life of 5 years. Thus for a...

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  16. 200 Mev energy is released when one nucleus of .^235U undergoes fissio...

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  17. In each fission of U^235, 200 MeV of energy is released. If a reactor ...

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  18. In a nuclear fission 0.1% of mass is converted into energy. The energy...

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  19. Calculate the energy released by fission from 2 g of .92^235U in k Wh....

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  20. An explosion of atomic bomb release an energy of 7.6 xx 10^13J. If 200...

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