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Atoms and Nuclei Test - 57

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Atoms and Nuclei Test - 57
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  • Question 1
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    Half life of radioactive element depends upon
  • Question 2
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    The decay constant of radium is 4.28 × 10–4 per year. Its half life will be
    Solution

  • Question 3
    4 / -1
    Half-life of radioactive sample, when activity of material initially was 8 counts and after 3 hours it becomes 1 count, is
    Solution

  • Question 4
    4 / -1
    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
    Solution

  • Question 5
    4 / -1
    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
    Solution

  • Question 6
    4 / -1
    Which shows radioactivity?
    Solution

  • Question 7
    4 / -1
    Three α - particles and one β - particle decaying takes place in series from an isotope 88Ra236. Finally the isotope obtained will be
    Solution

  • Question 8
    4 / -1
    A nuclear fusion reaction is given 1H2 + 1H2 → 2He3 + 0n1 + Q (energy). If 2 moles of deuterium are fused, then total released energy is
    Solution

  • Question 9
    4 / -1
    If the half life of a radioactive sample is 10 hours, its mean life is
    Solution

  • Question 10
    4 / -1
    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
    Solution

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