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Atoms and Nucle...

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  • Question 1
    4 / -1

    Half life of radioactive element depends upon

  • Question 2
    4 / -1

    The decay constant of radium is 4.28 × 10–4 per year. Its half life will be

  • Question 3
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    Half-life of radioactive sample, when activity of material initially was 8 counts and after 3 hours it becomes 1 count, is

  • Question 4
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    A sample contains 16 g of a radioactive material, the half life of which is two days. After 32 days, the amount of radioactive material left in the sample is

  • Question 5
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    A radio-isotope has a half-life of 5 years. The fraction of the atoms of this material that would decay in 15 years will be

  • Question 6
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    Which shows radioactivity?

  • Question 7
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    Three α - particles and one β - particle decaying takes place in series from an isotope 88Ra236. Finally the isotope obtained will be

  • Question 8
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    A nuclear fusion reaction is given 1H2 + 1H2 → 2He3 + 0n1 + Q (energy). If 2 moles of deuterium are fused, then total released energy is

  • Question 9
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    If the half life of a radioactive sample is 10 hours, its mean life is

  • Question 10
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    If 20 g of a radioactive substance due to radioactive decay reduces to 10 g in 4 min, then in what time 80 g of the same substance will reduce to 10 g

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