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Across 5. Maximum distance a point moves from its rest position when a wave passes. 8. The time for one oscillation. 10. A bending effect caused by a change speed. 11. Tiny waves. 12. Backwards and forwards movement. 14. Side to side movement. 16. Number of oscillations per second. 17. A surface containing points affected in the same way by a wave at a given time. 18. Is used to refer to any resonant frequency above the fundamental frequency. 19. Sound reflected off hard surfaces. 20. Example of transverse waves.

Down 1. Example of a longitudinal wave. 2. The sensation of a frequency. 3. Measurement of frequency. 4. A device for viewing oscillations by a display on the screen of a cathode ray tube. 6. Sounds above the range of human hearing. 7. When a wave bounces of a surface. 9. The use of sound waves and echoes to determine where objects are in space. 13. The distance between any point on a wave and the equivalent point on the next. 15. The shape of its graph as a function of time.