SOUNDS Crossword Puzzle

QUESTIONS LIST: wavelength : part of a wave, reflection : turning back of a soundwave, density : speed of sound in a medium depends on this, medium : sound need this to travel, collision : produced when particles vibrate faster, reverberation : multiple echoes, vacuum : sound cannot travel in this state, compression : part of a wave, echosounding : used by ship to detect ocean depth, vibration : occur when soundwaves are transmitted, solid : sound travel fastest in this medium, rarefaction : part of a wave, refraction : change in the speed of sound, longitudinal : wave used by sound, hot : sound travel fastest in this temperature, echo : reflected sound