vibrate – v. to move back and forth or from side to side with very short, quick movements

frequency – n. the number of times that something (such as a sound wave or radio wave) is repeated in a period of time (such as a second)

courtship – n. the behavior of animals that leads to sexual activity or the period of time when such behavior occurs

generate – v. create or make something happen

monitor – v. watch closely and keep track of

bounce – v. to move in one direction, hit a surface (such as a wall or the floor), and then quickly move in a different and usually opposite direction

pluck – v. to pull and release (a string on a musical instrument) with your fingers in order to make a sound


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