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Preview questions
1. What is sound?
A form of light · A mechanical wave · A type of energy · An electromagnetic wave
2. Which medium does sound travel fastest in?
Air · Water · Solid · Vacuum
3. What is the unit of frequency?
Hertz · Decibel · Newton · Joule
4. What is the range of human hearing?
20 Hz to 20 kHz · 20 kHz to 20 MHz · 1 Hz to 100 kHz · 10 Hz to 10 kHz
5. What is the phenomenon of reflection of sound called?
Refraction · Echo · Absorption · Diffraction
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