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What do you mean by half-life of a radio...

What do you mean by half-life of a radioactive substance ?

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The time in which half number of atoms present initially in a sample decay is known as half-life o f a radioactive element.
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MODERN PUBLICATION-NUCLEI-REVISION EXERCISES (VERY SHORT ANSWER QUESTIONS)
  1. Why tritium and plutonium are not found in observable quantities in na...

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  2. Amongst alpha,beta and gamma-particles, alpha-particle has maximum pen...

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  3. What do you mean by half-life of a radioactive substance ?

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  4. Write the relation between Half-Life and Mean-Life of radio active ele...

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  5. Define the activity of a radionuclide. Write its SI unit. Give a plot ...

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  6. 1 Decay per second are equivalent to what unit of radioactivity?

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  7. By which process does a cobalt nucleus change into a nickel nucleus?

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  8. एक रेडियोसक्रिय पदार्थ की सक्रियता 1 रदरफोर्ड हैं पदार्थ में प्रति सेक...

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  9. Calculate the energy equivalent of 1 a.m.u. in MeV

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  10. Write the relation between volume and the mass number of an atomic nuc...

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  11. What are isotopes? Give one example.

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  12. What are isobars? Give examples.

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  13. What are isotones? Give examples.

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  14. In both beta^(-1) and beta^(+) decay processes, the mass number of a ...

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  15. Why is it found experimentally difficult to detect neutrinos in nuclea...

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  16. Explain alpha- decay ?

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  17. Why alpha particles have high ionising power than beta rays?

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  18. How do the mass number and atomic number change in alpha -decay? A nuc...

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  19. What percentage of a radioactive substance will left undecayed after f...

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  20. A radioactive nucleus decays by emitting one alpha and two beta partic...

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