Tag Archives: Sound Waves

How does a siren work?

A siren is a kind of whistle which makes a loud noise as air is blown through holes in a spinning cylinder or disk.  It is a wailing noise When a fire truck roars through the streets, its loud siren warms people to get out of the way.  An ordinary air siren has two cylinders, …

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How is our voice recorded on a tape recorder?

Tapes are recorded by printing magnetic patterns of sound on a special plastic tape. A tape recorder stores the sound of your voice on a thin, plastic tape that has been treated with a chemical so it can be magnetized. To make a tape recording of your voice, you speak into a microphone.  The microphone …

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How does a radio work?

A radio changes the radio waves sent out by a broadcasting station back into sound waves that we can hear. When you listen to a radio, you may wonder how the sounds get to your radio from the broadcasting station. The answer is that your radio picked up the sounds in the form of radio …

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How does radar work?

Almost everyone has heard echoes.  When you shout toward a cliff, the sound waves of your voice bounces back as an echo. Radar works in much the same way.  It is an electronic device that can detect distant objects by bouncing radio waves off of them and listening for echoes. Objects such as airplanes and …

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What is the deepest spot in the ocean?

The single deepest spot so far known in all the oceans is in the Pacific near Guam.  It is called the “Challenger Deep” and is 36,198 feet below the surface of the ocean. If the highest mountain in the world, Mt. Everest, were put into the Challenger Deep, more than a mile of water would …

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What makes an ECHO?

If you shout or clap your hands in a canyon, the sound may make an echo.  An echo is a sound that we hear after it is reflected, or bounced back, from some large obstacle. When you call out in a canyon, the sound waves of your voice travel through the air in all directions.  …

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