Question

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

Explanation:

Step1: Identify a complete wavelength

A complete wavelength is one full cycle from one point on the wave to the same - type point on the next wave (e.g., from crest to crest or trough to trough).

Step2: Count the cycles

By visually inspecting the sound - wave diagram, we can count the number of complete cycles. There are 4 complete wavelengths.

Answer:

4