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Sound
Explain how sound is created by objects that vibrate.
10
Objectives
100
Flashcards
70
Questions
90 min
Study time
CambridgeIGCSECombined ScienceWaves
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Sound outcomes10 objectives
- Explain how sound is created by objects that vibrate.
- Identify that humans can hear sounds in the frequency range of approximately 20 Hz to 20 kHz.
- Recognize that sound waves require a medium to travel through.
- Calculate the speed of sound in air by measuring distance and time.
- Explain how variations in amplitude and frequency influence the loudness and pitch of sound waves.
- Define an echo as the sound that is reflected back after hitting a surface.
- Characterize ultrasound as sound waves that have frequencies above 20 kHz.
- Illustrate that sound waves in air are longitudinal, consisting of compressions and rarefactions.
- Qualitatively describe compressions as areas of higher pressure where particles are closer together, and rarefactions as areas of lower pressure where particles are more spread out.
- Understand that sound generally travels faster in solids than in liquids, and faster in liquids than in gases.
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