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Science ch. 6,9,14
Question | Answer |
---|---|
conduction | transfer of energy through matter by colliding particles; takes place because the particles are always in constant motion |
radiation | the transfer of energy in the form of electromagnetic waves |
insulator | materials such as fleece or fiber glass; don't allow heat to move easily through them |
convection | the transfer of energy by the motion of heated particles |
nuclear fission | process of splitting a large atomic nucleus into 2 nuclei with a smaller mass |
nuclear fusion | the process of fusing together 2 atomic nuclei with low masses to form one nucleus with a larger mass |
chain reaction | an ongoing series of fission reactions |
tracer | a radio scope that is used to find or keep track of molecules in an organism |
critical mass | amount of fissionable material required so that each fission reaction produces approx. one more fission reaction |
opaque | a material that absorbs or reflects all light |
translucent | material that allows some light to pass through, but not enough to see objects clearly through it |
transparent | a material that admits almost all of the light striking it so objects can be seen |
index of reaction | property of material indicating how much light slows down when treaveling |
mirage | image of a distant object that results when air at ground level is much warmer or cooler than the air layers above it making the image refract |
pigment | colored material that absorbs some colors and reflects others |
when is kinetic energy transferred? | as particles collide |
what are good heat conductors? | solids particularly metals |
convection currents | transfer heat from warmer to cooler parts of a fluid |
what can convection currents create on earth? | rainforests and deserts |
what makes a good insulator? | gasses such as air |
vaccuum | a material that contains almost no matter to allow conduction or convection to occur |
Nuclear Fusion can only happen when... | the nuclei are moving fast enough to get close to eachother |
What are radio isotopes used as? | tracers to find or keep track of molecules in an oraganism |
What must light and matter objects do to be seen? | reflect light |
Reflection of light | a light wave strikes an object ad reflects |
law of reflection | the angle at which light strikes a surface is the same as the angle it is reflected |
regular reflection | reflection of light waves from a smooth surface |
diffused reflection | reflection of light waves from a rough surface |
Refraction of light | change in the speed of a light wave when it passes from one material to another |
the more light is slowed... | the longer the index of refraction |
index of refraction | indicates how much material reduces the speed of light |
prisms | separate white light into visible spectrum based on wavelengths |
What are colors determined by? | the wavelength of light an object reflects |
objects appear to be white because... | they reflect all colors of visible light |
objects appear to be black because... | they absorb instead of reflect all colors of visible light |
filters | make objects appear different colors than they really are |
seeing color | light enters the eye and is focused on the retina |
cone | distinguish colors and detailed shapes; (cells) that are most effective in the daytime |
rods | sensitive cells to dim light; most effective in nighttime vision |
color blindness | results when one or more sets of cones don't properly work |
pigment | colored material that absorbs some colors and reflects others |
primary colors of light | red,green, and blue |
primary colors of pigment | magenta, cyan, and yellow |
What are the primary colors of light? | additive colors; they combine to form white |
What are the primary colors of pigment? | subtractive colors; combine to form black |