Edexcel IGCSE Physics 3.5 Wave speed equation

Practise using v = fλ for waves, including formula recall, rearranging, unit conversion and checking graph data for constant speed.

Exam points

state or rearrange v = fλ using standard symbols for speed, frequency and wavelength
calculate v, f or λ after converting cm, GHz or other prefixes into SI units
evaluate graph pairs by comparing fλ values to test inverse proportionality

[Maximum number: 1]

This question is about sound waves.

A buzzer is an electrical device that produces sound.

The frequency of sound produced by the buzzer is 1400 Hz .

State the formula linking speed, frequency and wavelength of a wave.

(wave) speed = frequency × wavelength;

allow correct use of symbols and rearrangements e.g.
$\mathrm{v}=\mathrm{f} \times \lambda$
condone s as symbol for
speed

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3.5 Wave speed equation question 1