Radioactivity refers to the rate at which a particular nuclide undergoes radioactive decay. Which of the following units is used to measure radioactivity?

Correct option is B

The correct option is (B) Curie.

Explanation:
The Curie (Ci) is the unit used to measure radioactivity. It is defined as the amount of radioactivity in a material in which 3.7 × 10¹⁰ disintegrations occur per second. This unit is named after Marie Curie and Pierre Curie, pioneers in the study of radioactivity.

Information Booster:

• The Curie (Ci) is widely used in radiation therapy, nuclear medicine, and industrial applications.

• 1 Curie (Ci) = 3.7 × 10¹⁰ disintegrations per second.

• The Becquerel (Bq) is the SI unit for measuring radioactivity, where 1 Bq equals 1 disintegration per second.

• The Curie unit is used mainly in the context of large quantities of radioactive material, like radionuclides in medical or industrial settings.

• The Becquerel (Bq), which replaced the Curie in most scientific contexts, is used for lower levels of radioactivity.

Additional Knowledge:

Roentgen:

• The Roentgen (R) measures exposure to ionizing radiation, specifically gamma rays and X-rays, in air.

Weber:

• The Weber (Wb) is the SI unit of magnetic flux in electromagnetism and not related to radioactivity.

Candela:

• The Candela (cd) is the SI unit of luminous intensity and is used to measure the brightness of light emitted from a light source.