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Across 1. Change in pitch, or frequency, of a sound that occurs when a source of sound is moving, the reciver of sound is moving, or both. (2 Words) 4. Time required to complete one periodic cycle of motion. 7. Highest point of a transvers wave 12. Material that transmits light striking it so that objects can be seen clearly through it 13. The bending of a wave around a barrier; also occurs when waves pass through a narrow opening 14. A mechanical wave in which the disterbance of the wave is parallel to the direction of travel (2 Words) 16. Amount of energy a sound waves carries; measured in decibels 20. The ability of an object to vibrate by absorbing energy at its natural frequency 22. Type of wave that must travel through a medium. (2 Words) 23. Measure of the energy carried by a wave, shown by the maximum distance a wave moves from equlibrium 24. The bending of a wave as it changes speed, moving from one medium to another

Down 2. Waves created by vibrating electric charges; can travel through a medium or empty space. (2 Words) 3. The number of complete oscillations that a wave makes in one second; measured in Hertz 5. The least dense region of a compressional wave 6. Matter that a wave travels through 8. A mechanical wave in which particles move both parallel and perpendicular to the direction of travel (2 Words) 9. The frequency of a sound wave 10. Material that allows some light to to pass through 11. The distance between one point and the nearest point just like it on a wave 15. Material that absorbs or reflects light. 17. The change in direction of a wave, such as a light or sound wave, away from a boundary the wave encounters. 18. Unit of measure for sound level; also describes the scale of sound intensity 19. Lowest point of a transverse wave 21. A disterbance that carries energy through matter or space