Waves and Sound flashcards

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What is wavelength?Wave Properties: Spatial period of a repeating wave.
What is frequency?Wave Properties: Number of cycles per second.
What is period?Wave Properties: Time per cycle, T = 1/f.
What is amplitude?Wave Properties: Largest departure from equilibrium for the measured oscillation.
Must material travel with a mechanical wave?Wave Properties: No; the disturbance can propagate while particles oscillate.
What is reflection?Wave Behavior: A wave returning from a boundary.
What is transmission?Wave Behavior: A wave passing into or through another region.
What is interference?Wave Behavior: Superposition of overlapping waves.
What is a node?Wave Behavior: A location of very small amplitude in a standing-wave pattern.
What is superposition?Wave Behavior: Addition of overlapping disturbances in a linear model.
What is destructive interference?Wave Behavior: Partial or complete cancellation of displacements.
What stays fixed as frequency crosses an ordinary stationary boundary?Wave Behavior: The frequency imposed by the source.
How does an ideal fixed-end string reflect a pulse?Wave Behavior: With inversion.
What is an echo?Sound and Resonance: Sound reflected back after a delay.
What is echo distance?Sound and Resonance: d = vt/2 for a round-trip pulse.
What is the Doppler effect?Sound and Resonance: Observed-frequency shift from relative motion.
What happens to observed pitch as a source approaches?Sound and Resonance: It generally rises in the standard sound model.
Why does sound need a medium?Sound and Resonance: It propagates through mechanical disturbances in matter.
What mainly relates to pitch?Sound and Resonance: Frequency.
Why is echo time divided by two?Sound and Resonance: It includes outward and return travel.
What is resonance?Sound and Resonance: An enhanced driven response near a natural frequency, limited by damping.