29 terms

Chapter 18- The Electromagnetic Spectrum and Light

electromagnetic waves
transverse waves consisting of changing electric fields and changing magnetic fields
electric field
a region of space exerts forces on charged particles
magnetic field
a region of space produces magnetic forces
electromagnetic radiation
the transfer of energy by electromagnetic waves traveling through matter of across space
photoelectric effect
the emission of electrons from a metal caused by light striking the metal
packets of electromagnetic energy
the rate at which a wave's energy flows through a given unit
electromagnetic spectrum
the full range of frequencies of electromagnetic radiation
amplitude modulation
the amplitude of the wave is varied
frequency modulation
the frequency of the wave is varied
Color-coded pictures that show variations in temperature
a material that transmits light and allows most of the light that strikes it to pass through it
a material that scatters light
a material that either absorbs or reflects all of the light that strikes it
a copy of an object formed by reflected or refracted waves of light
polarized light
light waves that vibrate in only one plane
when light is redirected as it passes through a medium
the process in which white light seperates into colors
primary colors
three specific colors that can be combined in varying amounts to create all possible colors
secondary color
light that is a combination of two primary colors
complementary colors of light
any two colors of light that combine to form white light
a material that absorbs some colors of light and reflects other colors
complementary colors of pigment
any two colors of pigments that combine to make black pigment
objects that give off their own light
the light produced when an object gets hot enough to glow
a material absorbs light at one wavelength and then emits light at a longer wavelength
a solid material that can emit light by flourescence
a device that generates a beam of coherent light
coherent light
light in which waves have the same wavelength, and the crests and troughs are lined up