### Vibrations, Waves and Sound

Sarah Andrade, Lauren Brown and Lorisa Wells

Using chapters 12 and 13 in your book complete the crossword puzzle.

 period Vibration about an equilibrium position in which a restoring force is proportional to the displacement from equilibrium is _________. octave Intensity of the sound waves produced by a trumpet is .0012 when the trumpet is at a distance of 2.5 m. What is the power output of the trumpet? Assume sound waves are spherical. Round to a whole number. Sine When the amplitude is halved, the energy decreases by a factor of _____. Three ________ of almost every kind require a material medium in which travel. simpleharmonicmotion The number of cycles or vibrations per unit of time is ___________. Two The maximum displacement from equilibrium is ____________. directly A frequency shift that is the result of relative motion between the source of waves and an observer ____________. Compression Measurements show that the restoring force is _______ proportional to the displacement of the mass. wavelength The time it takes to execute a complete cycle of motion is _________. Four The distance between two adjacent similar points of the wave, such as from crest to crest or from trough to trough is ____________. Inversely A condition that exists when the frequency of a force applied to a system matches the natural frequency of vibration of the system is ___________. frequency Frequency and wavelength are ______ proportional. Ear The human ______ is divided into three sections. twenty The region of a longitudinal wave in which the density and pressure are greater than normal is ______________. Perpendicular A wave whose source vibrates with simple harmonic motion is called a _____ wave. amplitude The perceived highness or lowness of a sound, depending on the frequency of the sound waves is ___________. beat Unless struck very hard a tuning fork only vibrates at its ______________. fundamentalfrequency Sound waves that the average human can hear, called audible sound waves have frequencies between _______ and 20,000 Hz. Dopplereffect The interference of waves of slightly different frequencies traveling in the same direction, perceived as a variation in loudness is ____________. Pitch A string vibrates with a frequency of 197 Hz. Assuming the speed of sound in the air is 394 m/s. The wavelength of the sound waves produced by the string is ______. resonance The frequency of the thirteenth note is exactly twice that of the first note, and together the 13 notes constitute an __________. Waves In a transverse wave, vibrations are __________ to the direction of wave motion.

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