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Acoustics is the field of physics that deals with the study of sound. It involves the propagation of sound, and its interactions with matter. While sound can consist of a simple wave, which produces a simple tone most sounds form more complex waveforms such as that of a human voice. Sound and its interaction with matter, includes how its propagation is affected by changes in the matter that it passes through such as air to water, and air to solid. These changes result in both refraction and reflection.

Longitudinal compression waves.

Practical Applications

An ultrasound image of a human baby inside its mother.
Human ear.

A common application of acoustics is the design of amphitheaters for the best possible transmission of sound, such as the elimination of echoes and dead spots. Sound consists of longitudinal compression waves in matter.[1] Another important application of acoustics is ultrasound images. They provided a safe way to see inside the human body. This is particularly helpful for seeing and examining a baby insides the womb. Such images show that a human fetus is recognizable as a human being and not the nonviable tissue mass abortion advocates claim.

Ultrasound is an extension of sonar which likewise can produce image, though normally in water. In both cases it has taken considerable research in acoustics to develop these technologies, yet there are animals such as dolphins, and whales which naturally have this ability. This is an example of how reasonable it is to conclude that they were given these abilities by a creator who understands acoustics, since it highly improbable that such technology could be developed by natural selection working through random mutations.

Most applications of acoustics involve controlling refraction and reflection. Controlling these factors usually involve the shape of the boundary and/or the type of material involved.

The Human Ear

The human ear is an acoustical marvel that gathers, focuses and amplifies sound. It does this filtering out the sound of blood flowing through the ear drum. The ear stands as evidence of a creator since it is best explained as being designed by someone well acquainted with acoustics. Since sound is one of the ways we perceive the world, acoustics is important to our understanding of creation. It directly aids our understanding of how the universe works by showing how sound and related principles work. It indirectly aids our understanding of how the universe works by providing tools for material observations.


  1. Ackroyd, James E.; Anderson, Mark; Berg, Carmen; Martin, Dr. Brian E (2009). Physics. Canada: Pearson Education. p. 407. ISBN 978-0-13-505048-4. 

Related References