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When a nucleus undergoes radioactive dec...

When a nucleus undergoes radioactive decay, its new mass number is

A

always equal to its original mass number

B

always more than its original mass number

C

never more than its original mass number

D

never less than its original mass number

Text Solution

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The correct Answer is:
C
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NIKITA PUBLICATION-ATOMS, MOLECULES AND NUCLEI-MCQs
  1. The relation between half life period and decay constant is

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  2. A radioactive decay rate of 1 curie represents

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  3. When a nucleus undergoes radioactive decay, its new mass number is

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  4. The decay constant of a radioactive element is definded as the recipro...

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  5. The half life of a radioactive element is T and its initial activity a...

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  6. The decay constant of the end product of a radioactive series is

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  7. Half-life-speed of lead is:

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  8. The half life of 1 gm of a radioactive element of atomic weight M is T...

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  9. Rate of disintegration per atom is called

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  10. The value of decay constant is independent of

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  11. Which of the following is the unit of activity of a radiactive element...

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  12. Half-life of radioactive element depend upon

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  13. N atoms of a radioactive substance emit n alpha-particles per second. ...

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  14. If the half life of radium is 1620 years then its decay constant is

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  15. A radioactive substance decay to 1/5 of its original value in 56 days....

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  16. The activity of a radioactive substance is readuced by 80% in 100 days...

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  17. The half-life period of radium is 1600 years. The fraction of a sample...

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  18. A sample contains 10 mg of radioactive material of half life 270 days....

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  19. If a radioactive material has half life of one year, a sample will be ...

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  20. A radioactive substance decays to 1/64 of its initial quantity in 30 d...

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