Acoustics

Acoustics is the science of sound as it reacts to air, water and solid materials. Learn about topics from radar to white noise, plus find out why you can hear the ocean in a seashell.

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Learn More

Skipping Stones on Ice Makes Crazy Sci-fi Sounds

You know that sound synonymous with a certain laser blaster from a galaxy far, far away? Yeah. It sounds like that.

By Mark Mancini Nov 16, 2018 Physical Science / Acoustics

Mystery Behind Cuba's Alleged Sonic Attack Deepens

Listen in as the guys from Stuff They Don't Want You to Know investigate the sonic weapons "attack" in Cuba.

By Diana Brown Apr 3, 2018 Physical Science / Acoustics

Can you really shatter a glass with a high note?

There are so many things in this world that are possible, and shattering glass with sonic force is one of them – but just how probable is it, really?

By Christine Venzon Physical Science / Acoustics

Can a sound wave kill you?

A sound wave alone probably won't kill you. Crank the volume on a terrible song, though, and you just might annoy everyone to death.

By Oisin Curran Physical Science / Acoustics

The Skinny on Sonic Booms

A sonic boom occurs when a vessel breaks the speed of sound. So what is this infamous sonic boom, if not the shattering of the picture-window-in-the-sky?

By Hannah Holmes Physical Science / Acoustics

How to Measure Sound Travel in the Air

Did you ever wonder how to measure how fast sound travels in the air? Read this article to learn how to measure sound travel in the air.

By HowStuffWorks.com Contributors Physical Science / Acoustics

Pianos lose their tuning, guitars fall out of key -- even church organs need to be tuned every now and then. For centuries, the only sure-fire way to tell if an instrument was in tune was to use a tuning fork.

By Tristin Hopper Physical Science / Acoustics

Overtone

Overtone is a sound accompanying the main tone produced by a vibrating body. The number and loudness of overtones determine the timbre, or tone color, of a musical sound.

Physical Science / Acoustics

Resonance

An object free to vibrate tends to do so at a specific rate called the object's natural, or resonant, frequency.

Physical Science / Acoustics

Sound

Sound. When a drum is struck, the drumhead vibrates and the vibrations are transmitted through the air in the form of waves.

Physical Science / Acoustics

Tuning Fork

A tuning fork is a small U-shaped piece of steel that, when struck, produces a clear tone of unvarying pitch.

Physical Science / Acoustics

Acoustics

Acoustics, the branch of physics that deals with the production, transmission, properties, and effects of sound waves.

Physical Science / Acoustics

How Acoustic Levitation Works

The idea that something so intangible can lift objects can seem unbelievable, but it's a real phenomenon. Learn how acoustic levitation takes advantage of the properties of sound to cause solids, liquids and heavy gases to float.

By Tracy V. Wilson Physical Science / Acoustics

How LRAD Works

What makes sound a weapon? Review the basics of sound and discover exactly how the LRAD produces its "beam of sound." We'll also explore LRAD's hailing and warning abilities and other uses for sound.

By Tracy V. Wilson Physical Science / Acoustics

Why can you hear the ocean when holding a seashell to your ear?

Do you remember holding a large conch shell up to your ear to hear the ocean? Why does this work even when you're far away from the sea?

Physical Science / Acoustics

Can two cans and a string really be used to talk over a distance?

I was watching an old movie today, and two kids (neighbors) were talking to each other using two tin cans and a string. Does that really work? If so, why does it work?

Physical Science / Acoustics

What Is White Noise?

If you took all of the imaginable tones that a human can hear and combined them, you would have white noise. This phenomenon gets its name from white light -- what do the two have in common?

By HowStuffWorks.com Contributors Physical Science / Acoustics

What is a decibel, and how is it measured?

The decibel scale measures sound based on human hearing, which makes it one of the most unusual scientific measurements. How are decibel calculated and what do they tell us about sound?

Physical Science / Acoustics

What causes a sonic boom?

When an airplane flies faster than the speed of sound, you hear a large booming sound. But how can something that seems so simple cause such a boom?

Physical Science / Acoustics

How Radar Works

Radar seems to have infinite uses: Police use it to clock your speed, NASA uses it to follow satellites, meteorologists use it to track storms and the military uses it to track the enemy ... Learn all about radar technology!

By Marshall Brain Physical Science / Acoustics