Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Ch. 12 & 13 Vocab
| Term | Definition |
|---|---|
| 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
Popular Physics sets