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.