Apply MS 3b and MS 3c skills when rearranging wave speed and frequency-period equations.

This objective is about mathematical method rather than one memorised result. Students rearrange v = f? to find wave speed, frequency or wavelength, and rearrange f = 1/T to connect frequency with period. The working should show substitution, converted units and a final unit such as m/s, Hz, m or s. It also requires recognising reciprocal relationships: doubling frequency halves period, while changing wavelength affects speed only when the wave medium and context allow it. Within the subtopic Properties of waves in Waves in air, fluids and solids, the explanation is anchored to frequency, period, wave speed and uses those terms in the approved AQA GCSE Physics Waves context.