How many times does a sine wave typically cross 0° in one complete cycle?

A sine wave typically crosses the 0° line twice in one complete cycle. To understand this, consider the behavior of the sine function, which fluctuates between -1 and 1. In one full cycle, which spans from 0° to 360°, the sine wave starts at 0° (crossing the axis), rises to its maximum value of 1 at 90°, descends back to 0° at 180° (another crossing), continues down to its minimum value of -1 at 270°, and finally returns to 0° at 360°.

Since it crosses the 0° line at the start and halfway through the cycle down to the bottom and back up, the total number of crossings within one cycle is two. Thus, the correct answer regarding how many times a sine wave crosses 0° in one complete cycle is two.