Question

$\huge\fbox\color{blue}Question$
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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Answer 1

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.

Answer 2

Answer:

1) Sound wave

2)hertz

3) Faster , slower