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Physics Ch. 13

QuestionAnswer
Define compression. The region of a longitudinal wave in which the density and pressure are greater than normal.
Define rarefaction. The region of a longitudinal wave in which the density and pressure are less than normal.
Sound waves are ________ waves. Longitudinal.
What are frequencies under 20 Hz. known as? Infrasonic waves.
What are frequencies over 20,000 Hz. known as? Ultrasonic waves.
What do ultrasonic waves produce? Images, like in an ultrasound by the reflected sound waves.
Speed of sound depends on what? The medium. Sound travels faster through objects at which it can transfer between the particles quicker (solid vs. gas).
When do sound waves travel faster? Through objects at which it can transfer between the particles quicker (solid vs. gas).
Define pitch. Perceived highness or lowness of a sound.
What's the difference between pitch and frequency? Pitch: Perceived. Frequency: Can be measured.
What is pitch determined by? Frequency.
Frequency increases= _________ increases. Pitch.
Define the Doppler Effect. A frequency shift that is the result of relative motion between the source of waves and an observer.
Define intensity. The rate at which energy flows through an area.
What is the unit for intensity? Watts/(Meter)^2.
What is the unit for power? Watts.
What is the unit for frequency? Hertz.
What is the unit for beats? Hz/Sec.
Define decibel level. Relative intensity determined by relating the intensity of a sound wave to the intensity at the threshold of hearing.
Define natural frequency. The frequency at which a pendulum vibrate.
Define resonance. A condition that exists when the frequency of a force applied to a system matches natural frequency of vibration of the system.
Define fundamental frequency. The lowest frequency of vibration of a standing wave.
Harmonic series of standing waves on a __________. Vibrating string.
Define a beat. Interference of waves of slightly different frequencies traveling in the same direction, perceived as a variation in loudness.
Created by: OliviaRoark
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