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Understanding Sound and Acoustics

Sound is a branch of Physics that is concerned with the study of the physical properties of mechanical waves that are audible or can be heard. Acoustics includes trhe study of sound frequencies that cannot be heard, such as ultrasound and infrasound.

Ultrasound consists of sound frequencies higher than the upper audible limit of human hearing, while infrasound consists of frequencies below what can be heard.


The knowledge of Physics is important for the development of the products we use. It is also an interesting and exciting subject of value in many walks of life. There is a great need for people who understand scientific principles and know how to think logically. Your knowledge and skills in these areas can help you excel in school, advance your career or improve your business.

The purpose of these free online lessons is to give you a start at improving your scientific knowledge of physics that will help you become a champion in the field. If you have any questions, send me an email.

Sound Waves - Acoustics

Overview of Sound Waves


Frequencies and Wavelengths of Sound

Speed of Sound in a Gas


Creating Sound Waves

Making Sounds with Musical Instruments

Sound Created from a String or Wire

Equation for Sound Created from a String

Equation for Sound Created from a Wire

Reproducing Sounds

Doppler effect

Doppler Effect for Sound

Doppler Effect Equations for Sound

Traveling Faster than Sound


Detecting Sound Waves

How Obstacles Affect Sound Waves

Sound Echoes

Sound Seems Amplified Over Water

Beat Frequencies in Sound

Acoustics in Buildings


Noise Reduction

Active Noise Cancellation

Hearing - Using your Senses

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Wave Motion

Overview of Wave Motion

Units of Frequencies and Wavelengths

Waves and Obstacles

Waveform Noise

Pulse Waves

Doppler Effect for Waveforms

Conventions for Doppler Effect Equations

Summary of Doppler Effect Equations

Derivation of Doppler Effect Wavelength Equations

Derivation of Doppler Effect Frequency Equations

Derivation of Doppler Effect Velocity Equations

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Physics Resources



Experiments and Science Fair Projects

Interactive Graded Tests


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