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Light and Heat

TermDefinition
convex A mirror that curves outward, like a spoon; causes objects to look smaller
radiation (from the spectrum) when energy is transferred through an EM wave; all the different kinds can be found on the spectrum
EM spectrum range of frequencies/wavelengths that an EM wave can have in order from lowest frequency to highest
violet the color of light with the shortest wavelength (the most energy)
red the color of light with the longest wavelength (the least energy)
infrared has slightly longer wavelengths that red light; the amount of light it gives off depends on an objects temperature
ultraviolet has slightly shorter wavelengths than violet light; this EM wave has frequencies too high therefore it can cause a sunburn
opaque Objects that do not let any light pass through. They reflect or absorb the light, or both.
translucent Objects look fuzzy because light cannot travel straight through
transparent Objects can be seen clearly through a material
black All 7 colors of light are absorbed and none reflect and bounce into our eyes.
white All 7 colors reflect and bounce into our eyes.
absorption When light transfers energy to matter or "takes in" the light energy.
scattering Light is sent in many directions as it passes through a medium. Ex: dust or small particles
reflection When light bounces off a surface Ex: mirror
refraction When a wave changes direction as it goes through one type of medium into another Ex: prism
concave A mirror that is curved inward like a bowl; causes an object to look bigger or magnified
expand Increase in the volume (or size) of an object because of an increase in temperature
contract Decrease in the volume (or size) of an object because of a decrease in temperature
visible light the only part of the EM spectrum that we can see
radio waves the slowest EM wave; we use for communication like radio, TV, and alarm systems
microwaves the second slowest EM wave; we use it to heat food and in cell phones
x-rays an EM wave with a very high frequency; the waves can pass through tissue in your body but is absorbed by bone
gamma rays the EM wave with the highest frequency of them all; they are used for medical imaging like MRI and CT scans as well as to treat some diseases like cancer
conductor a material that transfers energy well because it traps in air and stays hot. Ex: any kind of metal
insulator a material that does not transfer energy well because it lets air flow through, doesn't stay hot. Ex: glass, wood, ceramic, wool, rubber, brick, plastic
Conduction heat is transferred from one object to another when they are touching
Convection heat is transferred from one object to another through a gas or liquid
Radiation (heat transfer) heat is transferred from one object to another through an EM wave (like sunlight, fire, x-rays, colors)
Created by: wwmsScience6