PHYS 0847 Lecture 7: Physics - Chapter 7
Document Summary
Waves are a way to move energy from one place to another without moving an object from one place to another. Frequency is the number of times the waves shakes up and down per second. Wavelength is simply the size of the wave. Sound is a microscopic wave sin the pressure of a material such as air. Your vocal cords, a speaker, a drum head, a guitar string, or any other sound-creating device shakes the air to create a pattern that moves from one place to another as a wave. The pattern of shaking in the air causes our ear drums to shake, and this can be perceived as a sound. In vinyl records, the pattern of shaking is physically etched into the record as a pattern of tiny bumps. The shaking of the needle as it goes over the bumps creates the pattern of shaking in the speaker.
