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Q: What is the unit of the physical quantity, (Radioactive) Activity ?
  • A. radian
  • B. Becquerel
  • C. steradian
  • D. kelvin
Correct Answer: Option B - Those elements found in nature which automatically emit invisible rays alpha, beta, gamma are called radioactive elements. Radioactivity basically refers to the particles which are emitted from nuclei as a result of nuclear instability. The SI unit of radioactivity is becquerel (Bq) and this term is named after Henri Becquerel. Unit of radioactivity is defined as the activity of a quantity of radioactive material where one decay takes place per second. 1 becquerel = 1 radioactive decay per second An older radioactivity unit is the curie (Ci) and the name has been taken from Pierre and Marie Curie. It is defined as that quantity of any radioactive substance which gives 3.7 X 10¹⁰ s⁻¹ disintegration (dps). Sometimes millicurie (mc) and microcurie (mc) are also used. Another unit is Rutherford (rd) and it is defined as the amount of radioactive substance which gives 106 disintegrations s⁻¹ (dps). 1 curie = 3.7×10¹⁰ radioactive decays per second 1 becquerel = 1 radioactive decay per second 1 rutherford = 1.106 radionuclide decays per second.
B. Those elements found in nature which automatically emit invisible rays alpha, beta, gamma are called radioactive elements. Radioactivity basically refers to the particles which are emitted from nuclei as a result of nuclear instability. The SI unit of radioactivity is becquerel (Bq) and this term is named after Henri Becquerel. Unit of radioactivity is defined as the activity of a quantity of radioactive material where one decay takes place per second. 1 becquerel = 1 radioactive decay per second An older radioactivity unit is the curie (Ci) and the name has been taken from Pierre and Marie Curie. It is defined as that quantity of any radioactive substance which gives 3.7 X 10¹⁰ s⁻¹ disintegration (dps). Sometimes millicurie (mc) and microcurie (mc) are also used. Another unit is Rutherford (rd) and it is defined as the amount of radioactive substance which gives 106 disintegrations s⁻¹ (dps). 1 curie = 3.7×10¹⁰ radioactive decays per second 1 becquerel = 1 radioactive decay per second 1 rutherford = 1.106 radionuclide decays per second.

Explanations:

Those elements found in nature which automatically emit invisible rays alpha, beta, gamma are called radioactive elements. Radioactivity basically refers to the particles which are emitted from nuclei as a result of nuclear instability. The SI unit of radioactivity is becquerel (Bq) and this term is named after Henri Becquerel. Unit of radioactivity is defined as the activity of a quantity of radioactive material where one decay takes place per second. 1 becquerel = 1 radioactive decay per second An older radioactivity unit is the curie (Ci) and the name has been taken from Pierre and Marie Curie. It is defined as that quantity of any radioactive substance which gives 3.7 X 10¹⁰ s⁻¹ disintegration (dps). Sometimes millicurie (mc) and microcurie (mc) are also used. Another unit is Rutherford (rd) and it is defined as the amount of radioactive substance which gives 106 disintegrations s⁻¹ (dps). 1 curie = 3.7×10¹⁰ radioactive decays per second 1 becquerel = 1 radioactive decay per second 1 rutherford = 1.106 radionuclide decays per second.