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Terms in this set (50)
discussed the colors and properties of light.
is considered to be the foundation of the modern scientific study of light..
isaac newton, 1704, published.
particle theory of light
the idea that light can be pictured as streams of tiny particles emitted by light sources.
dutch physchist(contempary of isaac newton)
proposed a wave theory of light: the idea that light actually consists of waves instead of particles.
james clerk maxwell
demonstrated that light seems ro consist of 2 transverse waves vibrating back and forth at right angles to each other.
these 2 waves act together as a single ELECTROMAGNETIC WAVE.
electromagnetic waves can
travel through empty space.
travel through air at 1087 ft/s(331 m/s) at 0 degrees C.
velocity varies with temperature.
must have a medium for propagation.
cannot be polarized.
both may be reflected.
both may be refracted.
travel in space or a vacuum at 299,792 km/s(186,272 mi/s).
dual trasverse waves.
velocity does not vary with temperature.
no medium required for propagation.
may be polarized.
both may be diffracted.
the wave velocity equation applies to both types of waves.(v=upside down y times f)
demonstrated the existence of invisible electromagnetic waves.
showed that radio waves had the same properties as light.
built a device to produce an oscillating electric current in a length of wire.
his device constituted the 1st radio transmitter and reciver.
speed= wavelength times frequency
v=upside down y times f.
speed of light=wavelength times frequency
c=upside down y times f.
wavelengths of high frequency radiation
are commonly measured in nanometers.
= one billionth of a meter.
we are able
of the light that is reflected from objects around us.
very short wavelengths are
measured in angstroms, named after swedish physchist ANDERS JONAS ANGSTROM.
= 1/10 nanomater.
inadvertadly discoveredin the 1880s that light above a certain frequency can knock electrons loose from atoms of certain metals.(photoelectric effect)
proved wave theory of light correct.
light has characteristics
of both particles and waves.
scientists say light has a ...
tiny bundles or "packets" of energy that make up light.
amount of energy depends on its frequency.
when interacting with matter
photons acts like particles, but when traveling through space, photons act like electromagnetic waves.
this theory says
light= bundles of packets of energy traveling as electromagnetic waves,
electromagnetic waves that our eyes can perceive.
the range of electromagnetic waves that our eyes perceive as having color.
red, orange, yellow, green, blue, and violet.
can be thought of as the mixture of all colors of light.
can be thought of as the absenence of color.
very weak white light.
of red,green, and blue light can create the illusion of any color.
because they "add together"= additive primary colors of light.
subtractive primary colors
magenta, cyan, and yellow.
dyes and pigments.
magenta doesnt correspond
to any frequency of light.
magenta= the way our eyes perceive blue and red light.
mixture of green and blue.
plants to carry on photoshynthesis.
invisible forms of light
radio waves, microwaves, and xrays.
are the basis of tv, radio, radar, medical devices.
reflection, refraction, diffraction, and interference.
dont require a medium to travel through a medium.
can travel through empty space.
much faster than Snd and H20 waves.
speed of light
the frequency of an electromagnetic wave
is inversely related to wavelength.
have a low frequency.
have a high frequency.
max plank and albert einstein
showed that light can be classified as "particle" or "wave".
wavelike- how light is transmitted.
particlelike- how light interacts with matter.
quantum theory of light
states that light has both a wave nature and a particle nature.
lowest frequency of VS are perceived as red.
highest frequency of VS are perceived as violet.
middle is green.
when all the frequencies of VS enter our eyes at the same time, we perceive white - mixture of all the colors (frequencies) of light.
when no frequencies of VS
enter our eyes, we perceive black- the absenenceof color(frequencies) of light.
perceived that a prism separates white light into its colors by refracting the light which passes through it.
is bent at a different angle.
is refracted the least.
is refracted the most.
because of the way our eyes
perceive color, the illusion of a certain of light can be created by the combination of light of other frequencies.
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