Which of the following is true about wave reflection?

The statement that wave reflection does not change the wave's speed is accurate because the speed of a wave is determined by the medium through which it travels. When a wave reflects off a surface, it changes direction but continues to travel through the same medium, so its speed remains constant. This principle applies to all types of waves, including sound, light, and water waves. The properties of the medium, such as density and elasticity, govern the wave's speed, not the reflection itself.

In contrast, the other statements are not true. The angle of reflection is equal to the angle of incidence, not half; reflection can occur with various types of waves, not just sound; and reflection does not inherently change the frequency of the wave, which is generally determined by the source of the wave. Therefore, the understanding that wave speed remains unchanged during reflection is pivotal in the study of wave behavior.