1.Wave motion that is parallel to the wave direction is described  as wave.

2. The time to make one complete cycle is .

3. The distance between successive crests of a wave is .

4. Wave motion that is perpendicular to wave direction describes a

        wave.

5. The number of waves that passes a given point in time is.

6. is a kind of wave that does not need a medium.

7. The highest point of a wave is called .

8. The unit for frequency is .

9. The part of a longitudinal wave where there are fewer particles is     

    called.

10. A region in a medium of longitudinal wave where molecules are 

      packed is called .​