Fill in the Blanks Fill in the Blanks: Exploring Sound and WavesOnline version Test your knowledge of sound and waves with this engaging fill-in-the-blanks game! by Murray Smith 1 longitudinal travels direction wave hertz amplitude medium Wavelength wavelength waves reflect loudness energy height Sound echo higher frequency vibrate is a type of that through a as waves . These waves are created by vibrating objects , which cause the surrounding particles to as well . The vibrations travel in , which can be described by their , , and . Frequency refers to how many times a wave oscillates per second , measured in ( Hz ) and the higher the frequency the the pitch of the sound . is the distance between consecutive peaks of the wave , while amplitude is the of the , which determines the of the sound . Sound waves are made of waves where the particles move in the same as the wave direction . Sound waves can also which makes are . Understanding sound and waves is crucial in fields such as music , engineering , and communication .