23.2.6—The exponential nature of radioactive decay, and sketch and use the

understand the exponential nature of radioactive decay, and sketch and use the relationship x = x 0e–λt, where x could represent activity, number of undecayed nuclei or received count rate.

Use —the exponential nature of radioactive decay, and sketch and use the to connect the rule to the data and decision in the question.

This matters because —the exponential nature of radioactive decay, and sketch and use the determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —the exponential nature of radioactive decay, and sketch and use the to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —The exponential nature of radioactive decay, and sketch and use the is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.