Physics Nuclear Physics ETEA 2022
PMDC Verified Question 38 of 98
Curie is the unit of:
A
Radioactivity
B
Temperature
C
Half-life
D
Transition of magnetism
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Radioactivity


Concept:

The Curie (Ci) is a traditional, non-SI unit of measurement in nuclear physics.

Solution:

  • It was originally defined as the radioactivity (decay rate) of exactly 1 gram of Radium-226.


  • It is precisely standardized today as \(3.7 \times 10^{10}\) disintegrations per second.


  • Therefore, it solely measures the activity of a radioactive source.


Why other options are incorrect:

Temperature is Kelvin/Celsius. Half-life is measured in seconds/years. Magnetism uses Tesla/Weber. (Note: "Curie Temperature" is a concept in magnetism, but "Curie" alone is the unit of activity).

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