Conceptual Physics Ch. 27 & 28
Earth receives a lot of ultraviolet radiation from the sun. Luckily most of it doesn't reach the ground, because it is...
absorbed by a protective layer of ozone gas in the upper atmosphere
Color seen on TV result from color...
addition
Sunsets are red because...
all of the above
The color of an object we see is determined by the.....
all of the above
Because of absorption, a polarizing filter will actually transmit 40% of incident nonpolarized light. Two polarizing filters with their axes aligned will transmit...
between 0% and 40%
When blue and yellow paints are mixed together, the result is green. The reason for this is that...
between blue and yellow pigments, all colors are absorbed except green.
If molecules in the sky scattered orange light instead of blue light, sunsets would be colored...
blue
Different colors of light correspond to different light...
frequencies
If an electron vibrates up and down 1,000 times each second, it generates an electromagnetic wave having a...
frequency of 1000 Hz
If sunlight were green instead of white, the most comfortable color to wear on a hot day would be...
green
The true color of water is...
greenish blue
Light reflected from a lake surface is polarized...
horizontally
The colors of light emitted by incandescent gases show the...
identities of atoms in the gas
Heat lamps give off mostly
infrared rays
When Roemer took measurements of on of Jupiter's moons......(cont.)
late
What is the wavelength of an electromagnetic wave that has a frequency of 1 Hz?
less than 1 m
Compare to the wavelength of ultraviolet waves, the wave length of infrared waves is....
longer
The complementary color of green is....
magenta
When red and blue light shine on a white sheet, the resulting color is..
magenta
The three paint colors that are useful for color subtraction are...
magenta, cyan, and yellow
Clouds are white because water molecules...
of different sizes form clusters, scattering different colors of light.
Light does not pass through what kind of material?
opaque
Light that reflects at glancing angles from nonmetallic surfaces, such as glass, water, or roads is...
polarized parallel to the surface
Complementary colors are two colors that...
produce white light when added together
The cyan color of ocean water is evidence that the water absorbs...
red
Magenta light is really a mixture of....
red and blue light
The colored dots that make up the color on a TV screen are...
red, blue, and green
The three primary colors of light for additive mixing are...
red, green, and blue
The color of an opaque object is determined by the light that is...
reflected
The sky is blue because air molecules in the sky act as tiny...
resonators that scatter blue light
The shadow produced by an object held close to a piece of paper in sunlight will be...
sharp
Electromagnetic waves with higher frequencies have wavelegnths that are...
shorter
Compared to its speed in the air, the speed of light in water is...
slower
Which of the following is NOT an electromagnetic wave?
sound
Which of the following are fundamentally different from the others?
sound waves
If you're looking for an instrument that tells what stars are made of, look for a..
spectroscope.
Colors seen on a photograph result from color...
subtraction
Perception of death is given by...
the combination of views in the eye-brain system
The shiny surfaces of metals have most to do with...
the free electrons in metal atoms
Light shines on a pane of green glass and a pan of clear glass. The temperature will be higher in...
the green glass
You are designing hand-held stereo viewers....
the left eye sees only the left view and the right eye only sees the right view
The primary purpose of polarized sunglasses is...
to block glare from reflections.
After randomly polarized light passes through a polarizer, it is...
totally polarized
Clouds...
transmit UV light
Electromagnetic waves are..
transverse waves
Light waves are...
transverse waves
What is the ultimate source of electromagnetic waves?
vibrating charged particles
The source of all electromagnetic waves is..
vibrating charges
The main difference between a radio wave and a light wave is its...
wavelength
The complementary color of blue is...
yellow
When red and green light shine on a white sheet, the resulting color is...
yellow
A tennis ball is most easily seen if its color is...
yellow-green
Humans are most sensitive to light that is...
yellow-green
If two polarizing filters are held with their polarization axes at right angles to each other, the amount of light transmitted compared to when their axes are parallel is...
zero
What is the frequency of an electromagnetic wave having a wavelength of 300,000 km?
1 Hz
How far is a light-second?
300,000 km
Which of these electromagnetic waves has the shortest wave length?
X Rays
The reason the sky is blue is that air molecules
absorb and then reemit blue light, scattering it in all directions
The white caps of waves as they overturn are evidence that the water has...
broken into an assortment of tiny particles that scatter all colors.
Electromagnetic waves...
can travel through a vacuum.
A sheet of red paper will look black when illuminated with...
cyan light
Solar eclipses are seen less commonly than lunar eclipses because...
earth's shadow on the moon is larger than the moon's shadow on earth
If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes..
for light to travel from sun to earth
