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12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 5 Mark Questions with Solution Part - II

12th Standard

    Reg.No. :
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Physics

Time : 00:30:00 Hrs
Total Marks : 25
    5 x 5 = 25
  1. A radioactive sample contains 2.2 mg pure \(_{ 6 }^{ 11 }{ C }\) which has half-life period of 1224 second Calculate.
    (i) the number of atoms present initially.
    (ii) the activity when 5 μg of the sample will be left.

  2. A nucleus of UX1 has a half-life of 24.1 days. How long a sample of UX1 will take to change 90% of it to UX2?

  3. A certain radioactive element disintegrates for an interval of time equal to mean life. What fraction of element disappears? What fraction of element is left?

  4. A radioactive isotope has a half-life of T years. How long will it take the activity to reduce to 3.125% of its original value?

  5. Determine the distance of closest approach when an alpha particle of kinetic energy 4.5 MeV strikes a nucleus of Z = 80, stops and reverses its direction.

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