Group+2

= **17.2 Properties of Mechanical Waves Notes** =

** Amplitude **- ** Maximum displacement of the medium from its rest position ** Frequency- The number of complete cycles per unit time for a periodic motion **
 * The more energy the wave has the more medium will be compressed or will be displaced
 * More energy the wave has the greater is its amplitude
 * Crest- higher part of wave
 * Trough- lower part of wave
 * The number of complete cycles in a given time
 * waves frequency equals the frequency of the vibrating source producing the wave
 * measured in: Hertz (Hz)[[image:noise-canceling-headphone-8.jpg]][[image:frequency.jpg]]

media type="custom" key="5881117" Speed- Ratio of the distance an object moves to the amount of time an object moves ** Formula to find speed: **speed = wavelength x frequency** ex) One end of a rope is vibrated to produce a wave with a wavelength of 0.25 meters and the frequency is 3.0 Hz. speed = 0.25m x 3.0 Hz 0.25m x 3.0 1/s speed = 0.75 m/s
 * Wavelength- Distance between a point on one wave and the same point on the next cycle of wave **
 * Increasing the frequency of a wave decreases its wavelength
 * If you assume that waves are traveling at a constant spped, then wavelength is inveresely proportional to frequency
 * Speed can change if it enters a medium or if pressure and/or temperature changes
 * Unit for speed: meters/second
 * 1Hz = 1/s