2. The unit for frequency is the _____________.

 3. The vibration of a string is an example of a ____________ wave.

 4. A ____________ wave is where the particles moved parallel to the direction of the wave.

 5. A _______________ wave is where the particles of the medium to vibrate perpendicularly to the direction of the motion of the wave.

 6. The ___________ is the time it takes for one wavelength.

 7. The highest point on a wave is the _____________.

 8. Sound waves are examples of ________________ waves.

 9. A wave with a frequency of 2000 Hz has a period of ____________.

 10. When the resulting sum of two waves produces a wave with a larger amplitude than the originals, it is called ______________.

 11. The wavelength of a wave moving at 240 m/s with a period of 20 seconds is ________.

 12. Multiplying the wavelength times the frequency of a wave gives you the ____________.

 13. When 2 or more waves interact, it is called ______________.

 14. ___________ is the spreading of waves around the edge of a barrier.

 15. The ____________ of a wave is its maximum displacement from rest.

 16. A wave with a wavelength of 40 m and a frequency of 840 Hz is moving at _________.

 17. Mechanical waves require ______________________ to move through.

 18. Two sound are combined and a softer, lower sound is produced.  This is an example of

 19. A wave moving at 250.0 m/s has a wavelength of  100.0 m.  What is it’s frequency?

 20. The law of reflection states that the angle of incidence is _______ the angle of reflection.