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The wavelength λ, frequency ν, and speed v of a wave are related by:

Av = λ / ν
Bv = λ × ν
Cv = λ + ν
Dv = ν / λ
Answer & Solution
Correct answer: B. v = λ × ν
In one time period T, the wave travels one wavelength λ. So v = λ/T. Since frequency ν = 1/T, we get v = λ × ν. This single equation links the spatial property (wavelength) and temporal property (frequency) via the wave's propagation speed in the medium.
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