Particles - Sound needs these to travel, Longitudinal - This is the type of wave sound is, Oscillate - Scientific word meaning repreatedly move back and forth, Frequency - How many wave cycles happen every second, Pitch - Affected by the frequency of the wave, Loudness - Affected by the amplitude of the wave, Amplitude - The maximum distance particles move from their rest position, Oscilloscope - A machine used to visualise waves, Vibration - All sounds must start with a...., Bat - An animal with a large hearning range, 20,000 Hz - The highest frequency a human can hear, Ultrasound - What we call sound with a frequency above 20,000 Hz,

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