If the phase of vibration is zero at the start of the wave cycle, then the phase when half of the wave cycle is completed will be

Explanation

A wave's phase refers to a point's position on the wave cycle at a given time. In simple terms, it indicates how far along the wave cycle the wave has progressed. The phase is typically measured in degrees or radians. When the phase of vibration is zero at the start of the wave cycle, it means that the wave is at its initial position. As time progresses, the wave starts to move and completes one full cycle. When half of the wave cycle is completed, it means that the wave has reached the midpoint of its oscillation. At this point, the wave has moved from its initial position to the opposite extreme position. In terms of phase, completing half of the wave cycle corresponds to a phase shift of 180 degrees. This means that the phase when half of the wave cycle is completed will be 180.