Physics Nuclear Physics MDCAT 2019
PMDC Verified Question 52 of 98
In relation \(\lambda T_{1/2} = 0.693\), which quantity is represented by \(\lambda\).
A
Half-life
B
Activity
C
Wavelength
D
Decay constant
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Decay constant


Concept:

This question requires knowledge of standard nuclear physics notation and definitions.

Solution:

  • The equation given is the standard mathematical relation between half-life and decay probability.


  • \( T_{1/2} \) stands for half-life.


  • \( \lambda \) mathematically represents the decay constant, defining the probability of an individual nucleus decaying per unit time.


Why other options are incorrect:

Although \(\lambda\) is the universal symbol for wavelength in optics and waves, in nuclear decay equations, it universally stands for the decay constant. Activity is represented by \(A\).

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