Cambridge IGCSE Physics3.4 Sound Checklist
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What's on this checklist
Core
- I can describe how vibrating sources produce sound.
- I can describe the longitudinal nature of sound waves.
- I can state that the approximate range of frequencies humans can hear is 20 Hz to 20 000 Hz.
- I know that sound waves need a medium to be transmitted.
- I know that the speed of sound in air is approximately 330–350 m/s.
- I can describe a method of finding the speed of sound in air by measuring a distance and a time.
- I can describe how changing the amplitude and the frequency of sound waves affects their loudness and pitch.
- I can describe an echo as the reflection of sound waves.
- I can define ultrasound as sound with a frequency higher than 20 kHz.
Extended
- I can describe compression and rarefaction.
- I know that, in general, sound travels faster in solids than in liquids, and faster in liquids than in gases.
- I can describe the uses of ultrasound in non-destructive testing of materials, in medical scanning of soft tissue and in sonar, including calculating a depth or distance from a time and a wave speed.