24.2.1—That X-rays are produced by electron bombardment of a metal target and

explain that X-rays are produced by electron bombardment of a metal target and calculate the minimum wavelength of X-rays produced from the accelerating p.d.

Use —that x-rays are produced by electron bombardment of a metal target and to connect the rule to the data and decision in the question.

This matters because —that x-rays are produced by electron bombardment of a metal target and determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —that x-rays are produced by electron bombardment of a metal target and to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —That X-rays are produced by electron bombardment of a metal target and is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.