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Preview questions
1. What is sound?
A form of light · A mechanical wave · A type of energy · An electrical signal
2. Which medium does sound travel fastest in?
Air · Water · Vacuum · Solids
3. What is the unit of frequency?
Hertz · Decibel · Watt · Newton
4. What is the range of human hearing?
20 Hz to 20 kHz · 20 kHz to 20 MHz · 0 Hz to 20 Hz · 10 Hz to 10 kHz
5. Which of the following is a characteristic of sound?
It can travel in a vacuum · It has a frequency · It is always loud · It is visible
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