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Across 4. Time for one complete wave to pass a fixed point 6. Points with maximum amplitude on a stationary wave 10. Phase __________ between two particles vibrating at the same frequency is the fraction of a cycle between the vibrations of the two particles 11. Maximum displacement of a vibrating particle from its equilibrium position 13. Oscillating electric and magnetic fields that do not need a medium to progress 14. Distance (and direction) of a vibrating particle from its equilibrium position 15. Waves that move out from a source and transfers energy from one place to another 19. Waves that pass through a substance by making the particles in a medium vibrate 20. Number of cycles of vibrations of a particle per second or number of complete waces passing a point per second 21. Where waves 'bounce' off a hard surface following this rule: angle of incidence = angle of ___________ 23. Waves which form forms when two waves with the same frequency travel in opposite directions and do not transer energy from one place to another 24. Waves with the same constant frequency and a constant phase difference 25. Transverse waves where the vibrations stay in one plane only 26. One complete ______ of a wave is from maxiumum displacement to the next maximum displacement

Down 1. For a wave in a medium this is a constant, determined by the product of frequency and wavelength 2. Points with zero displacement on a stationary wave 3. Fraction of a cycle a vibrating particles has completed since the start of the cycle 5. Angular measurement expressed as fractions of 2*pi - where 1 cycle = 360 = 2*pi 7. When waves spread out after passing through a gap or around an obstacle 8. Waves in which the direction of vibration of the particles is parallel to the direction in which the wave travels 9. When waves meet, they pass through each other, at the point where they meet they combine 12. When coherent waves pass through each other, cancellation and reinforcement occurs at fixed positions 16. Least distance beteen two adjacent vibrating particles with the same displacement and velocity at the same time 17. When waves cross a boundary and the speed and wavelength changes, causing the wave front to change direction 18. Waves in which the direction of vibration of the particles is perpendicular to the direction in which the wave travels 22. Unit of frequency