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Across 6. the motion of a wave through a medium, or motion of a wave from one medium to another medium 7. in a standing wave, the location where the particles of the medium are at rest 10. a reflection that occurs at a media boundary where one end of the medium is unable to vibrate 13. in a standing wave, the location where the particles of the medium are moving with greatest speed 15. a reflection that occurs at a media boundary where the second medium is less dense than the first medium 17. when a source of sound approaches an observer, the observed frequency of the sound increases 18. the process of forming a wave with a larger amplitude when two or more waves combine 19. a sound resulting from a string that vibrates with more than one frequency

Down 1. whole-number multiples of the fundamental frequecny 2. at any point the amplitude of two interfering waves is the sum of the amplitudes of the individual waves 3. the condition in which the frequency of a wave equals the resonant frequency of the wave's medium 4. the process of forming a wave with a smaller amplitude when two or more waves combine 5. the frequency at which a medium vibrates most easily 8. an interference pattern produced when incoming and reflected waves interfere with each other 9. the lowest frequency that can produce a standing wave in a given medium 11. the frequency of beats produced by the interference of two waves with slightly different frequencies 12. the process of generating a new wave when two or more waves meet 14. a reduction in the amplitude of a wave as a result of energy absorption or destructive intertference 16. periodic chance in sound intensity caused by the interference between two nearly identical sound waves