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Ch. 12 & 13 Vocab

TermDefinition
compression a region of high molecular density and high air pressure
rarefaction a region of lower molecular density and low air pressure
pitch the frequency of an audible sound wave determines how high or low we perceive the sound to be
doppler effect an observed change in frequency when there's relative motion between the source of waves and an observer
intensity the rate at which energy flows through a unit area perpendicular to the direction of wave motion
decibel a dimensionless unit that describes the ratio of two intensities of sounds; threshold of hearing is commonly used as the reference intensity
resonance a phenomenon that occurs when the frequency of a force applied to a system matches the natural frequency of a system, resulting in a large amplitude of vibration.
fundamental frequency the lowest frequency of vibration of a standing wave
harmonic series a series of frequencies that includes the fundamental frequency and integral multiples of the fundamental frequency
timbre the musical quality of a tone resulting from the combination of harmonics present at different intensities
beat the periodic variation in the amplitude of a wave that is the superposition of two waves of slightly different frequencies
electromagnetic waves a wave that consists of oscillating electric and magnetic fields, which radiate outward from the source at the speed of light
reflection the change in direction of an electromagnetic wave at a surface that causes it to move away from the surface
angle of incidence the angle between a ray that strikes a surface and the line perpendicular to that surface at the point of contact
angle of reflection the angle formed by the line perpendicular to a surface and the direction in which a reflected ray moves
virtual image an image from which light waves appear to diverge, even though they are not actually focused there; a virtual image cannot be projected on a screen
concave spherical mirror a mirror whose reflecting surface is a segment of the inside of a sphere
real image an image that is formed by the intersection of light rays; a real image can be projected on a screen
convex spherical mirror a mirror whose reflecting surface is an outward-curved segment of a sphere
linear polarization the alignment of electromagnetic waves in such a way that the vibrations of the electric fields in each of the waves parallel to each other
Created by: accident_prone