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Preview questions
1. What is sound?
A form of light · A form of energy · A type of matter · A chemical reaction
2. Which medium does sound travel fastest in?
Air · Water · Solid · Vacuum
3. What is the unit of frequency?
Hertz · Decibel · Newton · Joule
4. Which of the following is a characteristic of sound?
It can travel through vacuum · It can be reflected · It has a fixed speed · It is always loud
5. What determines the pitch of a sound?
Amplitude · Frequency · Wavelength · Speed
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