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Sound
Explain how sound is created by objects that vibrate.
12
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90 min
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Sound outcomes12 objectives
- Explain how sound is created by objects that vibrate.
- Explain that sound waves are longitudinal waves.
- Identify that humans can hear sounds in the frequency range of approximately 20 Hz to 20,000 Hz.
- Recognize that sound waves require a medium to travel through.
- Understand that the speed of sound in air is about 330 to 350 meters per second.
- Outline a method to measure the speed of sound in air using distance and time measurements.
- Explain how the loudness and pitch of sound waves are influenced by changes in amplitude and frequency.
- Define an echo as the sound that is reflected back after hitting a surface.
- Define ultrasound as sound waves that have frequencies above 20 kHz.
- Explain the concepts of compression and rarefaction in sound waves.
- Recognize that sound generally travels faster in solids than in liquids, and faster in liquids than in gases.
- Describe how ultrasound is used in non-destructive testing, medical imaging, and sonar, including how to calculate depth or distance using time and wave speed.
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