### Vibrations, Waves and Sound

Sarah Andrade, Lauren Brown and Lorisa Wells

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

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Across
4.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 ______.
5.The time it takes to execute a complete cycle of motion is _________.
6.The perceived highness or lowness of a sound, depending on the frequency of the sound waves is ___________.
7.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.
9.The interference of waves of slightly different frequencies traveling in the same direction, perceived as a variation in loudness is ____________.
10.________ of almost every kind require a material medium in which travel.
12.A condition that exists when the frequency of a force applied to a system matches the natural frequency of vibration of the system is ___________.
15.A wave whose source vibrates with simple harmonic motion is called a _____ wave.
16.The distance between two adjacent similar points of the wave, such as from crest to crest or from trough to trough is ____________.
18.Frequency and wavelength are ______ proportional.
19.Vibration about an equilibrium position in which a restoring force is proportional to the displacement from equilibrium is _________.
20.Measurements show that the restoring force is _______ proportional to the displacement of the mass.
21.The number of cycles or vibrations per unit of time is ___________.
Down
1.Unless struck very hard a tuning fork only vibrates at its ______________.
2.When the amplitude is halved, the energy decreases by a factor of _____.
3.The frequency of the thirteenth note is exactly twice that of the first note, and together the 13 notes constitute an __________.
7.Sound waves that the average human can hear, called audible sound waves have frequencies between _______ and 20,000 Hz.
8.The human ______ is divided into three sections.
11.A frequency shift that is the result of relative motion between the source of waves and an observer ____________.
13.The region of a longitudinal wave in which the density and pressure are greater than normal is ______________.
14.In a transverse wave, vibrations are __________ to the direction of wave motion.
17.The maximum displacement from equilibrium is ____________.

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