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Across 1. Uses echo-sounding principle with microwaves, detecting positions of aircraft or ships 6. Ships use echo-sounders to measure the '_____' of the water 7. A person can be heard through an open window even if they cannot be seen because the sound wave is '_____' 9. Through which state sound travels fastest 11. Number of oscillations per second 12. The wave type when oscillations are up and down/from side to side 16. The squashed air caused by oscillations in a longitudinal wave 18. The material in which sound waves need to travel through 19. The speed of a wave is calculated Through the frequency multiplied by the '______' 20. The word used to describe sideways or backward and forward motion of waves 22. The effect of when a wave slows down and changes direction when passing through a more dense material 23. Frequency = speed '_____' by wavelength

Down 2. The maximum distance a point moves from its rest position when a wave passes 3. What causes sound waves 4. Sound reflected off of a hard surface 5. The effect used to describe when light hits off of a mirror 8. The stretched air caused by oscillations in a longitudinal wave 10. A machine that measures the pitch and volume of a sound 13. The wave type of a sound wave 14. '______' is used to scan the womb of a pregnant woman 15. The unit used to measure the speed of a wave 17. Frequency is measured in '______' 21. This object can be used to demonstrate the movement of the 2 different waves