2.3.54 - De Broglie wavelength

Use the de Broglie equation λ = h/p.

Use - de broglie wavelength to connect the rule to the data and decision in the question.

This matters because - de broglie wavelength determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - de broglie wavelength to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - De Broglie wavelength is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.