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Across 6. sound waves travel best in ________ 7. sound at higher frequency than the human ear can hear 10. wave movements cause_________ on the water 12. Number of waves passing any point per second 17. ships use _________ to measure the depth of water beneath them 21. when sound waves bend 22. sound waves are caused by _________ 23. This detects the positions of aircraft or ships by measuring the echo times of microwave pulses 24. distance= _______ x time

Down 1. sound travels ________ the distance when calculated 2. An animal that uses ultrasound to locate insects 3. sound waves can be displayed graphically using a 4. To and fro movements of the waves 5. this is the distance between any point on a wave and the equivalent point on the next 8. when sound waves move through a gap or reach a corner __________occurs 9. In a vacuum sound cannot travel because there are no ___________ 11. sound waves are _______________ waves 12. In industry for detecting ________ in manufactured materials 13. a sound caused by a reflection of sound waves from a surface back to the listener 14. When you speak ______________ and rarefactions travel through the air 15. waves are often drawn using lines called 16. is the maximum distance a point moves from its rest position when a wave passes 18. We hear low frequencies as low notes: the have a low ______ 19. frequency is measured in 20. In sound waveforms the larger the amplitude the ______ the sound