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Across 2. Points with zero displacement on a stationary wave 4. Transverse waves where the vibrations stay in one plane only 7. Time for one complete wave to pass a fixed point 9. Maximum displacement of a vibrating particle from its equilibrium position 12. 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 16. For a wave in a medium this is a constant, determined by the product of frequency and wavelength 17. When waves meet, they pass through each other, at the point where they meet they combine 19. Waves in which the direction of vibration of the particles is parallel to the direction in which the wave travels 22. Points with maximum amplitude on a stationary wave 23. One complete ______ of a wave is from maxiumum displacement to the next maximum displacement 24. When coherent waves pass through each other, cancellation and reinforcement occurs at fixed positions 25. Angular measurement expressed as fractions of 2*pi - where 1 cycle = 360 = 2*pi 26. Least distance beteen two adjacent vibrating particles with the same displacement and velocity at the same time

Down 1. Number of cycles of vibrations of a particle per second or number of complete waces passing a point per second 3. Oscillating electric and magnetic fields that do not need a medium to progress 5. When waves spread out after passing through a gap or around an obstacle 6. Waves in which the direction of vibration of the particles is perpendicular to the direction in which the wave travels 8. Waves that move out from a source and transfers energy from one place to another 10. Fraction of a cycle a vibrating particles has completed since the start of the cycle 11. Waves that pass through a substance by making the particles in a medium vibrate 13. When waves cross a boundary and the speed and wavelength changes, causing the wave front to change direction 14. Where waves 'bounce' off a hard surface following this rule: angle of incidence = angle of ___________ 15. Distance (and direction) of a vibrating particle from its equilibrium position 18. Phase __________ between two particles vibrating at the same frequency is the fraction of a cycle between the vibrations of the two particles 20. Waves with the same constant frequency and a constant phase difference 21. Unit of frequency