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Nuclei — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsNuclei3 Marks
Question
  1. Define ‘activity’ of a radioactive material and write its S.I. unit.
  2. Plot a graph showing variation of activity of a given radioactive sample with time.
  3. The sequence of stepwise decay of a radioactive nucleus is


If the atomic number and mass number of $D_2$ are 71 and 176 respectively, what are their corresponding values for D?
✓

Answer

  1. The total decay rate (of a sample)at the given instant, i.e., the number of radionuclides disintegrating per unit time is called the activity of that sample. The SI unit for activity is becquerel (Bq).
  2. Graph:
  1. 72 and 180.

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