Other Cool Stuff

Videos

What is sound? —Explains the physical properties of sound.
Travel Inside the Ear—Explains how sound travels inside our ear to be interpreted by the brain.

If you are experiencing playback difficulties due to a slow connection, or If you want to watch the video without being connected to the Internet, you can download the video to your computer.

Noise Ruler

How loud is
too loud?

150

Firecracker

120

Ambulance siren

110

Chain saw, Rock concert

105

Personal stereo system at maximum level

100

Wood shop, Snowmobile

Motorcycle

Power mower

Heavy city traffic

Normal conversation

Refrigerator humming

Whispered voice

Protect Your Hearing.

Know which noises can cause damage. Wear earplugs when you are involved in a loud activity.

110 Decibels

Regular exposure of more than 1 minute risks permanent hearing loss.

100 Decibels

No more than 15 minutes of unprotected exposure recommended.

85 Decibels

Prolonged exposure to any noise at or above 85 decibels can cause gradual hearing loss.

Get sound advice.

For more information, contact the NIDCD Information Clearinghouse.

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