DEFINE + examples
frequency
the number of wavelegths that pass through a given point each second
do light waves make up part of the electromagnetic spectrum, yes or no
yes
opaque object
some materals do not allow any light to pass through
ex. wood, metals
if 2 objects have the same temperature, which one has the most thermal energy
the one with most particles/matter
temperature describes how
hot or cold matter is
conductors
are matirals, such as metals, through which thermal energy does not move easily
ex. metals
describe how fiber optics work
is another kind of technology that uses light. They are made of a long thin, transparent strands mad eof plastic or glass.
refraction
is the binding of the light waves as they move from one notel to another
that is the electromagnetic spectrum
a rang with all electromagnetic waves, that you can and can't see with the human eye
the main colors of light energy are _____,_________,____________,___________,_______________,________________,_______________
red
orange
yellow
green
blue
indigo
violet
transparent object
allow nearly all light to pass through
ex. clear window glass
most substances _________ or _________ in size when they gain thermal energy and warm up
expand or increase
--------- ---------
most substances contract when they _____
lose thermal energy
how are we able to see the specific colors of objects
because the point on the object will absorb all other colors so it reflects the point color
describe the way convection works in a pot on the stove
The heated water from the bottom of the pot rises to the top, and the cooler water from the bottom sinks to the bottom. As the water in the pot moves, it transfers thermal energy by convection.
translucent object
allow some light to pass through, but we can not see through them clearly
ex. frosted glass
example: on a hot day, ice cream changes from a
solid to a liquid
heat also can cause a change in____________
matters physical form or state
thermal energy depends on the
particles moving
radiation can also happen when ____________such as _____ is _______
matter air present
thermal energy
the sum of energy of all the moving particles in an object
heat can
cause matter to change in size
reflection
occurs when light waves bounce off an object
explain why refraction happens
the differences in the way light waves bend causes the pencil to appear in two pieces
energy from the _____ moves through___________________________by________
Sun millions of kilometers of space radiation