Chapter 11 Sound And Light

Front 1

sound waves

Back 1

a longitudinal wave that is caused by vibrations and that travels through a material medium.

Front 2

pitch

Back 2

A measure of how high or low a sound is depending on its frequency.

Front 3

infared sound

Back 3

slow vibrations of frequency lower than 20 H

Front 4

ultra sound

Back 4

any sound wave with frequencies higher than 20,000 Hz

Front 5

Resonance

Back 5

The phenomenon that occurs when two objects naturally vibrate at the same frequency.

Front 6

sonar

Back 6

Sound navigation and ranging, a system that uses acoustic signals and echo returns to determine location of objects or to communicate

Front 7

Photon

Back 7

a unit or quantum of light

Front 8

Intensity

Back 8

the rate at which the energy flows through a given area of space

Front 9

Radar

Back 9

RAdio Detection And Ranging, a system that uses reflected radio waves to determine the velocity and location of objects.

Front 10

light ray

Back 10

a line in space that matches the direction of the flow of radiant energy

Front 11

Virtual Image

Back 11

an image that forms at a location from
which light rays appear to come but do not actually come

Front 12

real image

Back 12

an image of an object formed by light rays
that come together at a specific location

Front 13

total internal reflection

Back 13

the complete reflection that takes place within a substance when the angle of incidence
of light striking the surface boundary is less than the critical angle

Front 14

lens

Back 14

a transparent object that refracts light waves such that they converge or diverge to create an image

Front 15

magnification

Back 15

a change in the size of an image compared with the size of an object

Front 16

prism

Back 16

in optics, a system that consists of two or more
plane surfaces of a transparent solid at an angle with each other

Front 17

dispersion

Back 17

in optics, the process of separating a wave
of different frequencies into its individual component waves