Sci Ch 12 Les 1-3
Photon
A tiny bundle of energy through which light travels. A particle of light.
Opaque objects let
little light through.
Low notes
low pitch...like a tuba. Musical notes are defined by their pitch. Frequency (pitch) is NOT the same as amplitude (volume).
Sound waves need a
medium to travel through.
A rainbow is an example
of a spectrum.
A train's whistle sounds different when it is moving towards you and then when it is moving away from you due to
the Doppler effect.
Convection
the flow of heat through a liquid or a gas, caused by hot parts rising and cooler parts sinking.
Hertz
is the unit of measurement for frequency.
Image
A "picture" of the light source that light rays make in bouncing off a polished, shiny surface.
Sound wave
A series of rarefactions and compressions traveling through a substance.
Light has properties of
BOTH waves and particles.
Temperature
a measurement of the average energy of the particles in an object
Light can be separated by
a prism.
Sound waves CANNOT travel through
a vacuum.
a blanket would
absorb sound
Surfaces that are soft, thick, and uneven are best for
absorbing sound waves.
Transparent objects
allow almost all light through.
What a stick would look like in a clear glass of water with half the stick in the water and half out
bent or in two
Translucent objects
blur light that passes through.
Different materials have different heat
capacities.
Low heat capacity
change temperature quickly
High heat capacity
change temperature slowly
A prism is a
cut piece of clear glass (or plastic) with two opposite sides in the shape of a triangle or other geometric shape.
High notes have a greater
frequency than low notes.
High notes
high pitch...like a whistle.
A band of colors produced when light goes through a prism
is a spectrum.
Temperature
is the measurement of the average energy of molecules.
heat
is the total amount of thermal energy an object releases.
a wall would
reflect sound
Surfaces that are hard, thin, and smooth are best for
reflecting sound.
Conduction
the passing of heat through a material while the material itself stays in place
Sound is only a
wave.
The Doppler effect is a change in pitch due to
wavelength compression and expansion.
