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A freshly prepared radioactive source to...

A freshly prepared radioactive source to half-life `2 hr`, emits radiatiosn of intensity which is 64 times the permissible safe level. The minumum time after which it would be possibleto work safely with the source is:

A

`6 hr`

B

`12 hr`

C

`24 hr`

D

`128 hr`

Text Solution

Verified by Experts

The correct Answer is:
`(b)`
`N = (N_(0))/(64) = (N_(0))/(2^(6)), :. N = 6`
Thus total time `= 2xx6 = 12hr`.
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P BAHADUR-RADIO ACTIVITY-Exercies 3A
  1. Consider the following process of decay, .(92)^(234)U rarr .(90)^(23...

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  2. The nucleus and an atom can be assumed to be spherical. The relation ...

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  3. A freshly prepared radioactive source to half-life 2 hr, emits radiati...

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  4. Two radio-isotopes P and Q of atomic weight 10 and 20 respetively are ...

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  5. Half-life on an element is 't' secound. In t//2 second the fraction o...

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  6. A radiioactive element X, decays by the sequence and with half-lives, ...

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  7. A radioactive element X has an atomic number of 100. It decays directl...

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  8. When .(17)Cl^(35) undergoes (n,p) reaction, the radioisotope formed is...

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  9. A radioactive isotope has initial activity of 28 dpm Its activity is r...

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  10. The number of beta- particle emitted during the change .(a)X^(c ) rarr...

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  11. The nucler reacion, .(29)^(63)Cu + .(2)^(4)He rarr .(17)^(37)Cl + 14...

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  12. The mass number of a nuclide is 64. What is its nuclear radius?

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  13. In the nuclear chain ractio: .(92)^(235)U + .(0)^(1)n rarr .(56)^(1...

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  14. One mole of A present in a closed vessel undergoes decay as: .(Z)^(A...

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  15. The half life of .^(131)I is 8day. Given a sample of .^(131)1 at t = 0...

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  16. Number of neutrons i8n a parent nucleus X, which gives .(7)^(14)N afte...

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  17. The activity fo a radio nuclide (.^(100)X) is 6.023 cuire. If the d...

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  18. Sulphur 35(34,96903 amu) emits a beta- particles but no gamma-rays. Th...

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  19. A radioactive element A decays with a decay constant lambda. The fract...

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  20. Which of the following can show gamma- emission?

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