![]() ![]() Humans are actually not among the greatest hearing species in the world. As with light waves, the level of sound wave frequencies that can be perceived is dependent upon the capability of the species body. When the frequency of the sound waves changes, it creates a change of pitch in the sound that is heard by the human ear. Low frequency sound waves produce low tones while high frequency waves create high-pitched tones. These vibrations are either high frequency or low frequency. When sound waves hit materials, they cause vibrations. Sound waves are also different in the sense that they travel through any type of substance, whether solid, liquid or gas, whereas light travels best through empty space. Sound waves move much slower than light waves at speeds of about 1,125 feet (about 340 meters) per second. Sound waves are much different than light waves in the manner in which they travel.
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