Sound and Light Crossword Puzzle

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QUESTIONS LIST: wave speed : the speed of a wave in any given medium e.g. the speed of sound in air, pitch : how high or low pitched a sound is, indicated by higher or lower frequency, longitudinal : a wave in which the medium vibrates in the same direction as the direction of propagation, absorption : when wave energy is taken in by a substance, transverse : a wave in which the medium vibrates at right angles to the direction of its propagation, amplitude : the height of a wave from the equilibrium to the peak or trough, rarefaction : a region of a longitudinal wave in which the waves are furthest apart, trough : the lowest point on a wave, reflection : the change of direction of a wave without passing through a boundary, oscilloscope : a machine which displays a graph of an oscillation, e.g. the electrical signal picked up by a microphone, frequency : the number of waves per second, microphone : converts a sound wave into an electrical signal, hertz : the unit of frequency, loudspeaker : converts an electrical signal into a sound wave, compression : a region in a longitudinal wave in which the compression are closer together, vacuum : an absence of any particles, equilibrium line : the horizontal line running through the middle of the wave, a point of zero displacement, ultrasound : a sound wave with a frequency higher than 20,000 hertz, medium : the material for which a wave is travelling, wavelength : the length of a single wave measured from peak to peak or trough to trough etc, peak : the highest point on a wave, transmission : when a wave passes through a substance