29 terms

Sound and Light Check Point

STUDY
PLAY
Sound
a disturbance that travels through a medium as a longitudinal wave
Speed of sound
dependent upon the temperature, stiffness, and density of the medium the sound travels through
Pitch
how high or low a sound seems to a person
Hertz
unit of measurement for frequency
Intensity
the amount of energy a sound wave carries per second through a unit area
Electromagnetic wave
a transverse wave that transfers electric and magnetic energy and does not have to have a medium
Transparent
a material that transmits most of the light that strikes it
Translucent
a material that scatters the light that passes through it
Opaque
a material that reflects or absorbs all of the light that strikes it
Color of an opaque object
color of light it reflects
Color spectrum
formed by visible light separated
Primary colors of light
red, blue and green
White light
all of the colors of light shining together
Pigments
colored substances used to color other materials (ink, dyes and paints)
Scattering
when a beam of light strikes particles in the air transferring energy to these particles; gradually the beam loses brightness as it travels
Regular reflection
reflection that occurs when parallel rays of light hit a smooth surface
Image
a copy of the object formed by reflected or refracted rays
Refraction
The bending of waves due to a change in speed, such as entering a new medium
Primary colors of pigments
yellow, cyan and magenta
Iris
the colored ring of muscle that controls the size of the pupil
Cornea
the transparent front surface of the eye
Secondary colors
two primary colors combined in equal amounts
Diffuse reflection
reflection that occurs when parallel rays of light hit an uneven surface
Pupil
an opening through which light enters the inside of the eye
Mirage
an image of a distant object caused by refraction of light
Rainbow
caused by the refraction of light as it passes from air into water
Vibrations and a medium
necessary for sound
Echo
a reflected sound wave
Green apple
is green because it reflects green and absorbs all of the other colors