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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 ____________.