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1. Sound in air travels as a_____wave.
2. The SI unit of frequency____.
3. Sound travels_______in solids and______in gases.
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2
Answer:
Dusk generally refers to the transition from day to night, and the term is often used as another word for evening twilight. However, there is a formal definition that is more specific.
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2
Answer:
1) Sound wave
2)hertz
3) Faster , slower
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