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The half-life of a radioactive substance...

The half-life of a radioactive substance is 20 min. the time taken between 50% decay and 87.5% decay of the substane will be

A

25 min

B

30 min

C

10 min

D

40 min

Text Solution

Verified by Experts

The correct Answer is:
D
Binding energy of neutron,
`E=Deltamxx931`MeV
`=(1300335-13)xx931MeV=3.12MeV`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-ATOMS, MOLECULES AND NUCLEI -Exercise 1 (TOPICAL PROBLEMS)
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  2. A radioactive decay can form an isotope of the original nucleus with t...

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  3. The half-life of a radioactive substance is 20 min. the time taken bet...

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  4. A uranium nucleus ""(92)U^(238) emits and alpha-particle and a beta-pa...

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  5. ""(92)"U"^(235) undergoes successive disintegrations with the end prod...

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  6. A nucleus with Z =92 emits the following in a sequence: alpha,beta^(...

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  7. Half life of a radio-active substance is 20 minutes. The time between ...

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  8. The fraction of atoms of radioactive element that decays in 6 days is ...

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  9. A common example of beta^(-) decay is ""(15)P^(32) to ""(16)S^(32)+x+y...

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  10. The activity of a radioactive sample is measures as N0 counts per minu...

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  11. For the radioactive nuclei that undergo either alpha or beta decay, wh...

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  12. The radioactivity of a sample is l(1) at a time t(1) and l(2) time t(2...

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  13. A radioactive nucleus of mass number A, initially at rest, emits an al...

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  14. In a radioactive disintegration, the ratio of initial number of atoms ...

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  15. The activity of a radioactive sample is measured as 9750 counts per mi...

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  16. A radioactive sample S(1) having the activity A(1) has twice the numbe...

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  17. A radioactive material decays by simulataneous emission of two particl...

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  18. Number of nuclei of a radioactive substance at time t=0 are 2000 and 1...

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  19. The ratio of molecular mass of two radioactive substances is 3//2 and ...

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  20. Number of nuclei of a radioactive substance at time t=0 are 2000 and 1...

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