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Sound is a form of energy that spreads out through space. Part 1 1. Sound waves with frequencies below 20 hertz are called ……. Sound waves with frequencies above 20,000 hertz are called ……. Humans can …….. sound waves. Dogs, however, can hear frequencies of 2. What is the source of all sound? Part.2 The sound waves that humans cannot hear are those with frequencies from 20 to 20,000 Hz. below 20 Hz. above 20,000 Hz. both B and C Sound travels in air by a series of compressions. rarefactions. both compressions and rarefactions. pitches. Sound travels faster in a vacuum compared to liquids. gases compared to liquids. gases compared to solids. solids compared to gases. The speed of sound varies with amplitude. frequency. temperature. pitch. The loudness of a sound is most closely related to its frequency. period. wavelength. intensity. When ...
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