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Sound Waves are mechanical: true . Sound waves are transverse: false. Sound waves are longitudinal: true. Sound waves are electromagnetic: false. Sound waves travel through a vacuum: false. Sound waves are ________ the ear can detect: vibrations. Human ears can typically detect sound waves with frequencies between ____ and ____ Hertz: 20 and 20,000. As a wave's frequency increases, the wavelength becomes ______ : shorter. As the wavelength becomes longer, the frequency of the wave _________ : decreases. The higher the frequency of a sound wave, the higher the _____ : pitch. By decreasing the frequency of the sound wave, the pitch will be _____: lower. When the amplitude of a sound wave increases, the _____ also increases: volume. Sound waves are slower than radiant waves: true. Sound travels slowest through ________ : gasses. Sound travels the fastest through _____: solids