Physics

4. What acoustic variable is defined as mass per volume?
5. ___ Electromagnetic waves will work in a ___
7. For a __ wave, the frequency is the number of cycles of maxima and minima.
8. Sound is a ____ mechanical wave.
10. The ___ is the time it takes for the wave to transition from compression through refraction and back to compression.
12. The period and the frequency are __ of each other.
13. ___ are a mechanism of transferring energy from one location to another.

1. ___ waves need a medium to propagate through.
2. ___, pressure, density and particle motion are all acoustic variables.
3. ___ is the physical distance from one compression to the next.
6. The maximum variation of a variable from its mean value is known as __.
7. ___ waves propagate by particle motion perpendicular to the wave propagation direction.
9. What is the unit of measure for frequency?
11. If the frequency of a wave increases, the ___ decreases.