Question

wave b (the bottom one)
wave a (the top one)
which of the longitudinal waves has more frequency?
(wave a has 3 waves and wave b has 9 waves)

Explanation:

Step1: Recall Frequency Definition

Frequency ($f$) is the number of waves (cycles) per unit time. If two waves are in the same time interval, the one with more waves has higher frequency.

Step2: Compare Wave Counts

Wave A has 3 waves, Wave B has 9 waves. Since \( 9 > 3 \), Wave B has more waves in the same (implied) time frame.

Answer:

Wave B (the bottom one)