how many wavelengths are present in the sound wave shown?\n1\n2\n3\n4

Explanation:

Step1: Identify a single wavelength

A wavelength in a longitudinal wave is the distance between two consecutive compressions.

Step2: Count the number of compressions

The image shows three distinct regions of high coil density (compressions).

Step3: Determine the total wavelengths

The wave starts with a compression and ends after the third compression, covering two full cycles between them. $$n = 2$$

Answer:

2