Sound, Energy, Waves, Medium, Object, Surface, Bounce, Reflection, Echo, Hearing, Clarity, Empty room, Mountains, Voice, Obstacle, Wall, Building, Rock, Reflecting surface, Distance, 17 metres, Original sound, Repeated sound, Hard surface, Smooth surface, Soft surface, Rough surface, Absorption, Reverberation, Disturbance, Megaphone, Loudspeaker, Stethoscope, Heartbeat, SONAR.

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