Question

counting wavelengths
how many complete wavelengths are present in the sound wave shown?
1
2
4
6

Explanation:

Step1: Recall wavelength definition

A wavelength is the distance between two consecutive points in phase (e.g., two crests or two troughs) on a wave.

Step2: Count wave - lengths in the figure

By visually inspecting the sound - wave figure, we can count the number of complete cycles. Each complete up - and - down motion represents one wavelength. After counting, we find there are 6 complete wavelengths.

Answer:

O 6