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Across 1. The name given for the reflection of sound of walls, cliff faces, etc. (4) 2. The reciprocal of period; the number of oscillations per second of the particles of the medium due to the wave passing through. (9) 8. The speed and direction in which the wave energy is propagating. (8) 10. The wave type in which propagation is by the particles of the medium oscillating at 90 degrees to the direction of energy propagation. (10) 11. The Greek letter used to represent wavelength. 12. A sound term which is related to the amplitude of a sound wave. (6) 16. The "whoop-whoop" sound produced by the superposition of sound waves of very similar, but slightly different, frequencies. (5) 17. The maximum displacement of particles of the medium from their equilibrium positions. (9) 18. The type of wave which travels at 300 million metres per second. (15) 21. Another, more common, word, used in music, to indicate frequency. (5) 22. The process of something passing on; what wave energy undergoes within a medium. (11) 23. The type of wave that requires a material medium to propagate it. (9) 24. The distance between any 2 immediately neighbouring particles of the medium that have the same speed AND direction of motion. (10)

Down 1. The type of wave which travels only through the vacuum of space or the vacuum between particles of a medium. (15) 2. The letter/symbol used to represent frequency. 3. The point of a medium carrying a transverse wave at which the particles of the medium has a maximum positive amplitude. (5) 4. An everyday term for the mixture of frequencies in a given sound (4) 5. The wave type in which propagation is by the particles of the medium oscillating in the same direction as the energy propagation. 6. The time it takes for one whole wavelength to pass through a point on/in the medium. (6) 7. The distance that particles of the medium move from equilibrium as the wave energy passes (12) 9. The letter/symbol used to represent the speed of light. 12. The letter/symbol used to represent velocity. 13. The zone of a medium carrying a compression wave in which the particles of the medium are closer together than at equilibrium, with no wave energy passing through. (11) 14. The adding of 2 or more wave energies of the same kind, travelling in the same medium. (13) 15. The zone of a medium carrying a compression wave in which the particles of the medium are further apart than at equilibrium, with no wave energy passing through. (11) 19. The substance through which a wave propagates. (6) 20. The point of a medium carrying a transverse wave at which the particles of the medium has a maximum negative amplitude. (6)