Question

how many complete wave cycles, or wavelengths, are shown in t diagram?

Explanation:

Step1: Understand wave cycle

A wave cycle (or wavelength) is from one peak to the next peak (or one trough to the next trough).

Step2: Count wave cycles

Looking at the diagram, we can count the number of complete wave cycles. There are 2 complete wave cycles (from peak to peak) shown.

Answer:

2