Examples
How does Sound Energy Work
How does Sound Wave Transfer Energy to Your Ears
How is Sound Energy Measured
Conversion of Sound Energy
Uses
Car honkingAirplane taking offPolice whistlingDog barkingWind howlingBaby crying
Sound requires a medium to propagate. It can travel through air, water, wood, glass, or metal. Unlike light, sound cannot propagate in a vacuum since there are no particles to transmit the wave. Sound wave frequency is measured in the unit of Hertz or Hz. One Hertz is equal to one sound vibration in one second. For a human to hear the sound, the frequency must be between 20 and 20,000 Hz. Any frequency below 20 Hz is called infrasound; above 20,000 Hz is called ultrasound. These two types of sound are inaudible to the human ear.
A microphone converts sound energy to electrical energyA loudspeaker converts electrical energy into sound energyA drummer converts mechanical energy into sound energyAn electric bell converts electrical energy into sound energy
Scientists use infrasonic sound to predict an earthquake, volcano, and avalancheA particular type of sound, SONAR (Sound Navigation And Ranging), is used to map the ocean floorDoctors use ultrasound to cure tumor cells of a cancer patient without any physical painDoctors also use ultrasound on pregnant women to detect any abnormality in the fetusUltrasound is used in the industry to detect any flaws in machinery parts and to determine the thickness of metalSoothing musical sound from Tibetian bowls can remove stress and body painBats produce ultrasonic waves to communicate among themselves and to find obstacles in their path
