the definitions and terms of waves
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| sound | produced when matter vibrates, sound travels as a longitudinal wave
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| pitch | depends on the frequency( how fast the medium vibrates) of a wave
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| infrasonic | sound that is BELOW the range of human hearing
(less than 20 Hz)
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| ultrasonic | sound that is ABOVE the range of human hearing
(greater than 20,000 Hz)
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| doppler | is a change in the frequency/pitch of a sound wave. it is caused by MOTION between the source and the receiver.
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| acoustic | the science of sound name
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| Diffraction | the change in direction of a wave when it encounters an obstacle
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| Refraction | the bending of waves as they pass from one medium to another at an angle
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| Standing Wave | a pattern of vibration that resembles a stationary wave
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| Reflection | the bouncing back of a wave when it meets a surface or boundary
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| Constructive interference | interference that increases amplitude
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| Destructive interference | interference that decreases amplitude
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| Principle of superposition | method of adding crests and troughs of interfering waves together to describe a new wave
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| Beats | sounds produced by the interference of sound waves that are uses to tune piano strings
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| Interference | the combination of two or more waves that results in a single wave
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| Nodes | points in a standing wave that have no vibration due to destructive interference
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