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Across 2. effect when frequency changes because of the movement of the source 10. type of interference when two peak line up 11. time for one cycle or one wave 12. number of waves or cycles per second

Down 1. distance from midpoint to peak of wave 3. term that refers to high or low frequencies of sound 4. bouncing back of a wave when it hits a boundary between two media 5. distance between two peaks or two valleys of a wave 6. type of interference when a peak lines up with a valley 7. type of wave with vibration in the same direction of travel (sound) 8. bending of a wave as is passes through the boundary between two media 9. type of wave with vibration at right angles to its direction of travel (light)