Qi) 27. When two or more waves are at the same place at the same time, is called __

## Step 1<br />The problem is asking for the term that describes the phenomenon where two or more waves are at the same place at the same time. This is a concept in wave physics, specifically in the study of wave interference.<br /><br />## Step 2<br />When two or more waves meet at the same point in space and time, they combine to form a new wave. This is known as interference.<br /><br />## Step 3<br />Interference can be constructive or destructive. Constructive interference occurs when the waves are in phase, meaning their peaks and troughs align. This results in a wave with a larger amplitude. Destructive interference occurs when the waves are out of phase, meaning their peaks and troughs are out of alignment. This results in a wave with a smaller amplitude.