PHYS 121 Chapter Notes - Chapter 20: Infrasound, Longitudinal Wave, Sound
10 Dec 2017
School
Department
Course
Professor
Document Summary
Most sound waves are produced by vibrations of matter. Original vibrations stimulates the vibration of something larger or more massive. The vibrating material then sends a disturbance through the surrounding medium, such as air, in the form of longitudinal waves. Pitch - the highness of lowness of a tone; related to wave frequency. Frequency corresponds to pitch -> high pitch = high frequency, low pitch = Infrasonic - sound waves with frequencies below 20 hertz. Ultrasonic - sound waves with frequencies above 20,000 hertz. Any elastic substance -- solid, liquid, gas, or plasma --can transmit sound. Elasticity is the property of a material that has changed shape in response to an applied force and then resume its initial shape once the distorting force is removed. Sound travels 4 times faster in water than in air and 15 times faster in steel than. Sound in air (20. 2) in air travels. Nonperiodic sound - wave pulse that travels in all directions.
