Physics Nuclear Physics KU 2024
PMDC Verified Question 4 of 98
\(\lambda\) is a ____ constant:
A
Decay
B
Dielectric
C
Plank's
D
Proportionality
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Decay


Concept:

In the context of nuclear physics, universal Greek symbols have highly specific designations.

Solution:

  • The equation governing the rate of radioactive disintegration is \( \frac{dN}{dt} = -\lambda N \).


  • In this formula, the symbol \(\lambda\) represents the decay constant.


  • It physically denotes the probability per unit time that an individual nucleus will spontaneously decay.


Why other options are incorrect:

Dielectric constant uses \(k\) or \(\epsilon_r\). Planck's constant is \(h\). While \(\lambda\) is technically a constant of proportionality in the math, its official physical name is the Decay Constant.

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