What happens when a wave reaches the boundary of a new media?

it would reflect back.

When a wave reaches the boundary between two different media, several things can happen: reflection, transmission, and absorption. In the case of reflection, a portion of the wave energy is reflected back into the original medium.

To understand what happens when a wave reaches the boundary of a new medium, we need to consider the properties of the media involved, such as density, elasticity, and refractive index. When a wave encounters a new medium, the properties of the medium can affect how the wave behaves.

In the case of reflection, when a wave travels from one medium to another, it encounters an interface or boundary. If the properties of the two media are significantly different, such as having different densities or impedances, the wave will experience a change in its speed and direction at the boundary. This change in direction is called reflection.

When a wave reflects back upon hitting the boundary, the angle of incidence (the angle between the incident wave and the normal to the boundary) is equal to the angle of reflection (the angle between the reflected wave and the normal to the boundary), according to the law of reflection.

It's important to note that not all of the wave energy is reflected. Some of the energy can be transmitted into the new medium, causing the wave to continue propagating through it. Additionally, some of the wave energy can be absorbed by the medium, converting it into other forms of energy such as heat.

To predict and understand the behavior of a wave at the boundary of a new medium, it is necessary to consider the properties of both media and apply the relevant physical principles, such as the laws of reflection and transmission.