SOLID - Sound travels fastest through this medium, HERTZ - The unit used to measure the pitch of a sound., ECHO - A sound that is reflected or bounces back., FREQUENCY - The pitch of a sound is determined by the _______ of the soundwave., QUICKLY - Something with a high frequnecy vibrates _________, LOWER - The long end of a xylophone has a ________ pitch., PARTICLES - A sound cannot be heard in outer space because there are no _____ for the sound to travel through., VIBRATIONS - Sound produces __________ that travel to our ears., WAVES - Sound vibrations travel as ____________ ., KINETIC - Sound is a type of ____________ energy., TIGHT - A string telephone works best when the string is ________., STRINGS - The vibrations in a guitar are produced by the _______ .,

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