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Physics Ch. 13
Question | Answer |
---|---|
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. |