chapter 11 and 12 test Flashcards
the primary colors of light are the same as the primary colors of pigments.
False
Different colors of light are associated with different wavelengths.
true
Electromagnetic waves travel at the speed of sound.
false
The amount of light that passes through two polarizing filters depends on the angle between their polarizing axes.
True
Electromagnetic waves can travel through empty space.
true
When light strikes a transparent material, most of the light is reflected.
false
More light is transmitted through a translucent material than through an opaque material.
true
The primary light colors are red, green, and blue.
true
Paper does not reflect light very well because its surface is somewhat rough.
true
A red ball is red because it has absorbed red light.
false
Neon lights produce light through collisions of gas and electrons.
true
A photographic image of a 3-D object made without a lens is a hologram. ____________________
true
Gamma rays cause sunburn. ____________________
False - Ultraviolet radiation
Sodium-vapor lights are incandescent bulbs filled with a gas to make the filament last longer.
____________________
False - Tungsten-halogen
Particles do not behave as waves. ____________________
false - can
When light strikes a transparent material, most of the light is absorbed or reflected. ____________________
False - an opaque
The frequencies of ultraviolet waves are slightly higher than visible light. ____________________
true
Light reflected from a mirror makes a diffuse reflection. ____________________
False - regular
Almost all of the light that strikes a mirror is reflected by the mirror. ____________________
true
Regular reflection is the reflection of light from a rough surface. ____________________
false - diffuse
Electromagnetic waves can travel through empty space. ____________________
true
CFCs destroy the stratosphere. ____________________
false - ozone layer
Chlorine atoms in CFCs react with ozone in the atmosphere, causing ozone molecules to bond together.
____________________
False - break apart
Microwaves are used for cooking. ____________________
true
Incandescent lights are very efficient. ____________________
False - fluorescent
To get information onto a carrier wave, the station has to modify the carrier wave. ____________________
true
Magnets affect each other even when they are not touching because of electromagnetic waves.
____________________
False - magnetic fields
Cathode-ray tubes are sealed vacuum tubes in which photons are produced. ____________________
False - beams of electrons
If white light passes through a red filter, all of the red wavelengths are absorbed. ____________________
False - transmitted
An apple is red because it absorbs red light. ____________________
False - reflects
Fluorescent lightbulbs ____ than incandescent lights.
a. are less expensive
b. do not last longer
c. produce more heat
d. use less energy
d
FM frequencies are in the range of ____.
a. radio waves
b. microwaves
c. infrared waves
d. sonic waves
a
When changing AM radio stations you look for modifications in what part of the wave?
a. speed
b. frequency
c. wavelength
d. amplitude
d
Gamma rays are dangerous because they ____.
a. break down molecules and cells
b. cause sunburn
c. fluoresce
d. cause food to spoil
a
All of the following are part of seeing yourself in a mirror except ______.
a
A vibrating electric charge produces a(n) _______.
a. sound wave b. heat wave
c. compression wave d. electromagnetic wave
d
The speed of electromagnetic waves is ____.
a. greater in water than in air
b. different for each frequency in a vacuum
c. 300,000 km/s in a vacuum
d. less for light than for X-rays
c
Reflection of light waves from a smooth surface is ____.
a. diffuse reflection
b. mirror reflection
c. irregular reflection
d. regular reflection
d
Electromagnetic radiation with the shortest wavelengths is ____.
a. gamma rays
b. ultraviolet waves
c. radio waves
d. infrared waves
a
Electromagnetic waves ____.
a. are compressional waves
b. are transverse waves
c. must have a medium
d. are generated by static electricity
b
Fluorescent light bulbs ______ than incandescent lights.
a. do not last longer b. produce more heat
c. are less expensive d. use less energy
d
The primary pigment colors are ____.
a. magenta, cyan, and yellow
b. red, blue, and green
c. white and black
d. yellow, blue, and green
a
The color of an object is determined by the ______ of the light it reflects.
a. frequency b. intensity
c. wavelengths d. brightness
c
Glass is an example of a ____ material.
a. translucent
b. medium
c. opaque
d. transparent
d
____ are used for medical imaging.
a. Ultraviolet waves
b. Infrared waves
c. X-rays
d. Gamma rays
c
The primary pigment colors are ______.
a. magenta, cyan, and yellow b. red, blue, and green
c. yellow, blue, and green d. white and black
a
A gas commonly used in lighting devices is ____.
a. helium
b. neon
c. hydrogen
d. green
b
When you see a child playing in a big red wagon, the color you see is _______
a. reflected
b. refracted
c. absorbed
d. diffracted
a
The first two primary pigment colors are magenta and cyan. What is the third primary color of pigment?
a. yellow
b. green
c. violet
d. orange
a
Satellite television and cell phones use ____ to transmit signals.
a. microwaves
b. radio waves
c. ultraviolet waves
d. inferred waves
b
If light waves change speed when they pass from one medium into another, the light
will be ______.
a. reflected b. refracted
c. diffracted d. separated
b
Carrier waves are in the wavelengths of ____.
a. microwaves
b. infrared waves
c. radio waves
d. light waves
c
What wavelength of light is reflected from a red shirt?
a. red
b. all but red
c. white
d. green
a
The color ____ is produced by blending the three primary pigments.
a. black
b. cyan
c. magenta
d. white
a
Which color of light is produced by mixing red light and blue light?
a. white light
b. yellow light
c. magenta light
d. cyan light
c
A coffee mug is _____ while a wine glass is _____.
a. transparent; opaque
b. opaque; transparent
c. translucent; opaque
d. translucent; transparent
b
Tracing paper is ______.
a. opaque b. transparent
c. translucent d. reflective
c
The electromagnetic waves with wavelengths slightly longer than visible light are ____.
a. microwaves
b. infrared waves
c. ultraviolet waves
d. X-rays
b
A CD player uses a ______ to convert information to an electrical signal.
a. laser b. neon light
c. sodium-vapor light d. tungsten-halogen light
a
Electromagnetic waves travel as _______ waves.
a. compression b. rarefaction
c. transverse d. interference
c
Sound waves cannot be produced in space, because they need ____________________ to transfer energy.
matter
Electromagnetic waves with the longest wavelength are ____________________.
radio waves
Electromagnetic waves travel 300,000 km/s in ______________ , but they only travel __________________
in glass.
a vacuum, 200 000 km/s
Each radio station broadcasts on one particular frequency called a _________________________.
carrier wave
Light reflected off an uneven surface such as dirt is a ____________________ reflection.
diffuse
The kind of energy carried by electromagnetic waves is ____________________.
radiant energy
Any ____________________ can be formed by mixing the primary colors—magenta, cyan, and yellow.
pigment
The sealed vacuum chamber on a television set where images are displayed is a ____________________.
cathode–ray tube
____________________ waves are used to kill bacteria on medical supplies.
Ultraviolet
Electric current flowing through a tube creates vivid lights; they are often used for signs and decorations.
neon lights
A mixture of neon, argon, and sodium metal is heated; these lights are often used for streetlights.
sodium-vapor lights
A filament is heated until it glows; these lights are often used in home light fixtures.
incandescent lights
A tungsten filament is housed inside a quartz bulb; these lights are often used on movie sets or in underwater photography.
tungsten-halogen lights
tinted windows
opaque
mirror
reflexive
clear glass vase
translucent
clay flowerpot
opaque
colored plastic wrap
translucent
windows
transparent
You see a diagram of a rainbow that includes white and black. Is this accurate? Explain your answer.
No; although objects appear to be black, black isn’t present in visible light. Objects that appear black absorb all colors
of light and reflect little or no light back to your eye. White objects appear to be white because they reflect all colors
of visible light.
Why are optical fibers often used in communications?
Telephone conversations, television programs, and computer data can be coded in light beams.
Signals cannot leak from one fiber to another and interfere with other messages, so the signal is transmitted clearly.
Why do we see our reflection in a glass window but see nothing when we look at a brick wall?
A glass window is a smooth surface that reflects an image because it reflects parallel light waves in only one direction.
A rough surface like a brick wall reflects parallel light waves in an infinite amount of directions.
Light enters into the prism and is refracted when_____________________________
it enters the prism and again when it leaves the prism.
Because the longer wavelengths are refracted less than the shorter wavelengths, red light
is________________
bent the least.
As a result of these different amounts of bending,_____________________________
the different colors are separated when they emerge from the prism.
Describe the ozone layer and explain why it is necessary for our health.
The ozone layer is a layer of gas (O3) high in the atmosphere. It absorbs most of the sun’s harmful ultraviolet radiation. Without it, the ultraviolet radiation would be deadly.
Must a transparent material be colorless? Explain.
No; it could be a filter.
Why do some objects or materials appear to feel and look smooth produce clear reflections? What type of
reflections do they produce?
Sometimes materials appear and feel smooth, but under high magnification its shows rough spots. They produce diffuse
reflections.
The prefix infra- means “below” and the prefix ultra- means “beyond.” Explain why the terms infrared and
ultraviolet are appropriate for these two segments of the electromagnetic spectrum.
Infrared means “below red,” and this part of the spectrum has frequencies that are just below the visible color red. Ultraviolet means “beyond violet,” and this part of the spectrum has frequencies just above the visible color violet.
What causes a rainbow to form?
When the Sun shines during a rain shower, the raindrops act like individual prisms. Sunlight passing through the raindrops is separated into the individual colors of the visible spectrum, which creates the rainbow.
