Physics Nuclear Physics NUMS 2023
PMDC Verified Question 26 of 98
The [time] taken for half the number of atoms of radioactive isotopes to disintegration is called:
A
Average life
B
Mean life
C
Total life
D
Half life
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Half life


Concept:

This question relies entirely on recognizing a fundamental definition in nuclear physics.

Solution:

  • The exact interval of time required for 50% of the radioactive nuclei in a specific sample to undergo radioactive decay is defined universally as its Half-life (\(T_{1/2}\)).


Why other options are incorrect:

Average (Mean) life is defined as \(1/\lambda\), which is roughly 1.44 times longer than the half-life. Total life is essentially infinite.

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