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Two radioactive material A(1) and A(2) h...

Two radioactive material `A_(1)` and `A_(2)` have decay constants of 10 `lambda_(0)` and `lambda_(0)`. If initially they have same number of nuclei, then after time `(1)/(9 lambda_(0)) ` the ratio of number of their undecayed nuclei will be

A

`1/e`

B

`1/e^(2)`

C

`1/e^(3)`

D

`sqrt(e)/1`

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The correct Answer is:
A
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MOTION-RADIOACTIVITY -EXERCISE - 1
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  2. The half life of radioactive isotope is 3 hour. If the initial mass of...

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  3. The half-life of a radioisotope is four hours. If the initial mass of ...

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  4. Read the following : (i) The half-life period of a radioactive elem...

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  5. The radioactive sources A and B of half lives of t hr and 2t hr respec...

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  6. The half life of Tc^(99) is 6.0 hr. The delivery of a sample of Tc^(9...

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  7. How many atoms of 0.1 g-atom of a radioacitve isotope .(Z)X^(A) (half ...

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  8. A radioacive element decays by parallel path as given below: A overs...

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  9. Two radioactive nuclides A and B have half-lives 50 min and 10 min res...

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  10. A radioactive sample had an initial activily of 56 dpm (disintegratio...

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  11. The radioactivity of sample is R(1) at a time T(1) and R(2) at a time ...

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  12. .(13)Al^(27) is a stable isotope. .(13)Al^(29) is expected to disinteg...

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  13. Loss of beta-particles is equivalent to

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  14. Which of the following nuclear reactions will generate an isotope ?

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  15. Which of the following processes represents a gamma- decay only ?

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  16. Select correct statment(s):

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  17. Consider the following nuclear reactions : .(92)^(238)M to (Y)^(X)N+...

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  18. A radioactive element gets spilled over the floor of a room. Its half-...

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  19. The analysis of a uranium reveals that ratio of mole of .^(206)Pband ....

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  20. The ratio of C^(14) to C^(12) in a living matter is measured to be (...

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