Question

which is true of the waves a and b shown here? a b a has a lower frequency and a shorter wavelength than b. a has a higher frequency and a shorter wavelength than b. a has a lower frequency and a longer wavelength than b. a has a higher frequency and a longer wavelength than b.

Explanation:

Wavelength is the distance between two consecutive crests or troughs. Frequency is the number of waves passing a point per unit - time. Wave A has fewer waves in the same length compared to wave B, so A has a longer wavelength. Since frequency and wavelength are inversely related ($v = f\lambda$, where $v$ is the wave - speed), A has a lower frequency.

Answer:

A has a lower frequency and a longer wavelength than B.