Edexcel IGCSE Physics · Spec 3.21-3.23
Sound Waves
How sound waves travel and how we hear them.
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Sound Waves
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Spec 3.21-3.23
What you need to know
- Describe sound as a longitudinal wave
- State the human hearing range
- Read pitch and loudness on an oscilloscope
Active recall
Quick check
Answer each question before opening the answer.
What type of wave is sound, and what does it need to travel?
A longitudinal wave; it needs a medium and cannot travel through a vacuum.
What is the approximate range of human hearing?
About 20 Hz to 20 000 Hz (20 kHz).
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