# Waves & Sound Glossary Terms Chapter 9

 Interference -the process of generating a new wave when two or more waves meet Principle Of Superposition  -at any point the amplitude of two interfering waves is the sum of amplitudes of the individual waves Constructive Interference  -the process of forming a wave with a larger amplitude when two or more waves combine Destructive Interference  -the process of forming a wave with a smaller amplitude when two or more waves combine Media Boundary -the location where two or more media meet Free-end Reflection -a reflection that occurs at a media boundary where the second medium is less dense than the first medium; reflections have an amplitude with the same orientation as the original wave Fixed-end Reflection -a reflection that occurs at a media boundary where one end of the medium is unable to vibrate; reflections are inverted Transmission -the motion of a wave through a medium, or motion of a wave from one medium to another medium Transmission From Faster Medium To Slower -if the wave moving along the rope encounters a medium a medium that has a slower wave speed, then the wave splits into two, and one wave is reflected and the other is transmitted (the reflected wave is upright) Transmission From Slower Medium To Faster -if a wave moves into a faster medium, then the wave splits into two, and one wave is reflected and the other is transmitted (the reflected wave is inverted) Standing Wave -an interference pattern produced when incoming and reflected waves interfere with each other; the effect is a wave pattern that appears to be stationary Node -in a standing wave, the location where the particles of the medium are at rest Antinode -in a standing wave, the location where the particles or the medium are moving with greatest speed; the amplitude will be twice the amplitude of the original wave Fundamental Frequency Or First Harmonic (f0) -the lowest frequency that can produce a standing wave in a given medium Harmonics -whole-number multiples of the fundamental frequency Overtone -a sound resulting from a string that vibrates with more than one frequency Standing Wave Between Two Free Ends -standing waves can be generated in a medium with two open (free) ends (common in brass instruments) Standing Wave Between A Free End And A Fixed Standing Wave Between Two Fixed Ends -standing waves may be generated by having a source on one end, which is an antinode and a node at the other (created by a clarinet) Beat -periodic change in sound intensity caused by the interference between two nearly identical sound waves Beat Frequency -the frequency of beats produced by the interference of two waves with slightly different frequencies; equal to the difference in the frequencies of the interfering waves How To Calculate Beats And Beat Frequency  fb=f2-f1 Damping -a reduction in the amplitude of a wave as a result of energy absorption or destructive interference Resonant Frequency -the frequency at which a medium vibrates most easily Resonance -the condition in which the frequency of a wave equals the resonant frequency of the wave's medium Damping And Resonance In Vibrating Structures -when an external force vibrates such a system at a frequency close to the structure's resonant frequency, then resonance occurs increasing the amplitude significantly, perhaps to the point of damaging the building Doppler Effect -when a source of sound approaches an observer, the observed frequency of the sound increases; when the source moves away from an observer, the observed frequency of the sound decreases Calculating The Doppler Effect AuthorMalloryHaggith ID315330 Card SetWaves & Sound Glossary Terms Chapter 9 DescriptionWaves & Sound Glossary Terms Chapter 9 Updated2016-02-08T01:37:22Z Show Answers