Question:medium
Curie is a unit of
Curie is a unit of
Updated On: Jun 15, 2026
- energy of gamma rays
- half-life
- radioactivity
- intensity of gamma rays
Show Solution
The Correct Option is C
Solution and Explanation
The question asks about the unit of measurement referred by "Curie." Let's discuss each of the given options to determine why "Curie" is the correct answer for radioactivity.
- Energy of gamma rays: The energy of gamma rays is measured in electron volts (eV) or its multiples like keV or MeV. Thus, "Curie" is not a unit for this measurement.
- Half-life: Half-life is the time required for a quantity to reduce to half its initial value and is measured in units of time, such as seconds, minutes, hours, or years. Therefore, "Curie" is not used for half-life.
- Radioactivity: Curie (Ci) is a traditional unit used to measure the radioactivity of a substance. It is defined based on the activity of radium-226 and is equivalent to 3.7 x 1010 disintegrations per second. This makes it a suitable choice for measuring how radioactive a material is.
- Intensity of gamma rays: The intensity or strength of gamma rays is measured in terms of their energy per unit area, using units such as watts per square meter (W/m2), not in curies.
Given the explanations above, we can see that Curie is correctly associated with measuring radioactivity.
Therefore, the correct answer is: Radioactivity.
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