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Which is luminous?
Sun
A source of light given off as a result of high temperatures is said to be…
incandescent
An idealized materials that absorbs and perfectly emits electromagnetic radiation is a…
blackbody
Electromagnetic radiation is given off from matter at any temperature. This radiation is called…
blackbody radiation
Light interacts with matter by which process?
-Absorption
-Reflection
-Transmission
Materials that do not allow the transmission of any light are called…
opaque
Light is said to travel in straight-line paths, as light rays, until it interacts with matter. A line representing the orginal ray before it interacts with matter is called an…
incident ray
The image you see in a mirror…
is a virtual image
Refraction of light happens when light undergoes…
a change of speed between two transparent materials
The ratio of the speed of light in a vacuum to the speed of light in a transparent material is called the…
index of refraction
The part of the electromagnetic spectrum that our eyes can detect is…
visible
The component colors of sunlight were first studied by…
Newton
The color order of longer-wavelength waves in the visible region is…
red, orange,yellow,green,blue,violet
The separation of white light into its component colors is..
dispersion
Polarization of light is best explained by considering light to be…
vibrating waves in one plane
Light in one plane is transmitted and light in all other planes is absorbed. This is…
selective absorption
The photoelectric effect is best explained by considering light to be..
moving particles
The concept that vibrating molecules emit light in discrete amounts of energy, called quanta, was proposed by…
Planck
The photoelectric effect was explained, using Planck’s work, by…
Einstein
Today, light is considered to be packets of energy with a frequency related to its energy. These packets are called…
photons
Fiber optics transmits information using…
light
A luminous object…
produces light of its own by any method
An object is hot enough to emit a dull red glow. When this object is heated even more, it will emit…
shorter-wavelength, higher-frequency radiation
The difference in the light emitted from a candle, an incandescent lightbulb, and the Sun is basically due to differences in…
temperatures
You are able to see in shaded areas, such as under a tree, because light has undergone…
diffuse reflection
An image that is not produced by light rays coming from the image but is the result of your brain’s interpretations of light rays is called a…
virtual image
Any part of the electromagnetic spectrum, including the colors of visible light, can be measured in units of…
-wavelength
-frequency
-energy
A prism separates the colors of sunlight into a spectrum because…
each wavelength of light has its own index of refraction
Which of the following can only be explained by a wave model of light?
Interference
The polarization behavior of light is best explained by considering light to be…
transverse waves
Max Planck made the revolutionary discovery that the energy of vibrating molecules involved in blackbody radiation existed only in…
multiples of certain fixed amounts
Today, light is considered to be…
a small-scale phenomenon without a sharp distinction between particle and wave properties
As the temperature of an incandescent object is increased…
more radiation is emitted with a shift to higher frequencies
Is it possible to see light without the light interacting with matter?
No
The electromagnetic wave model defines an electromagnetic wave as having…
a velocity
a magnetic field
an electric field
Of the following, the electromagnetic wave with the shortest wavelength is…
X-rays
Of the following, the electromagnetic wave with the lowest energy is…
radio wave
Green grass reflects…
green light
Green grass absorbs…
all light but green light
We see a blue sky because…
scattering of light by air molecules and dust is more efficient when its wavelength is shorter
A pencil is placed in a glass of water. The pencil appears to be bent. This is an example of…
refraction
A one-way mirror works because it…
reflects and transmits light at the same time
A mirage is the results of light being…
refracted
A glass prism separates sunlight into a spectrum of colors because…
shorter wavelengths are refracted the most
Polaroid sunglasses work best in eliminating glare because…
reflected light is polarized in a horizontal direction only
The condition of farsightedness, or hyperopia, can be corrected with a…
convex lens
Today, light is considered to be a stream of photons with a frequency related to its energy. This relationship finds that..
higher-frequency light has more energy
An instrument that produces a coherent beam of single-frequency, in-phase light is a…
laser
The special theory of relativity is…
an analysis of how space and time are changed by motion
The general theory of relativity explains…
gravity as a change of space and time
Comparing measurements made on the ground to measurements made in a very fast airplane would find that…
the length of an object is shorter
clocks run more slowly
objects have an increased mass
Near-sightedness, or myopia, can be corrected with which type lens?
concave
The slower light moves through a given substance, the greater the substance’s index of refraction
True
The range of energies emitted by the Sun is most intense near the yellow-green wavelengths…
True
A mirage is caused by hot air near the ground…
refracting light rays upward
The index of refraction for flint glass is 1.5. This means that…
the speed of light is slower in this substance than it is in vacuum
A rainbow in the sky after a rainstorm always appears…
in the part of the sky opposite from the Sun
Longer wavelengths are affected more by a prism or water droplets than are the shorter wavelengths
False
What are the units of h in the equation E=hf
JxS
When an electric stove element is hot enough, it gives off a dull red glow. When it cools to the point that it no longer glows, it will…
emit only longer wavelength energy
During the day, a clear sky appears blue due to the light reflected from the oceans
False
interference is a property of light most easily explained by the particle model
False
The photoelectric effect could not be adequately explained with a wave model of light because the…
energy of the ejected electrons did not depend upon the intensity
Glare from water’s surface is light that tends to be polarized predominantly in the horizontal plane
True
Ultraviolet light waves carry more energy than infrared light waves
True
Polarized light vibrates…
only in one plane
Max Planck discovered that the blackbody radiation emitted by vibrating molecules…
appeared to come in multiples of certain fixed amounts
Phenomena such as diffraction and interference can be most easily explained in terms of the…
wave model of light
Polarizing sunglasses are useful because they are able to…
absorb reflected light, which is polarized
In the evening sky, the Sun appears reddish as it sets because….
more of the shorter, bluer wavelengths are scattered away by the dust and haze
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