Question

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

Explanation:

Step1: Define a complete wavelength

A complete wavelength is one full cycle of the wave, from one point to the next identical - looking point.

Step2: Count the cycles

By visually inspecting the sound - wave pattern, we can see that there are 4 complete cycles.

Answer:

C. 4