23.2.3—Activity and decay constant, and recall and use A = λN

define activity and decay constant, and recall and use A = λN.

Use —activity and decay constant, and recall and use a = λn to connect the rule to the data and decision in the question.

This matters because —activity and decay constant, and recall and use a = λn determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —activity and decay constant, and recall and use a = λn to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —Activity and decay constant, and recall and use A = λN is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.