Questions and answers by

mir

Questions (269)

What is a three-dimensional photograph created by using a laser?a sonogram a thermogram a photogram a hologram
1. 1 answer
2. 101 views
Why do prisms project a spectrum when a white light shines through them?different colors of light are refracted at different
1. 1 answer
2. 178 views
What does a concave lens look like?thicker in the center than at the edges thinner in the center than at the edges flat on one
1. 1 answer
2. 121 views
What is necessary to achieve total internal reflection?a small angle of incidence a mirror a large angle of incidence an optical
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2. 120 views
Which statement is not true of optical fiber?Optical fiber can carry thousands of phone conversations. Optical fiber completely
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2. 180 views
Which of the following is not a typical benefit from the use of optical fibers for surgery?Surgeons can make smaller cuts, or
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2. 155 views
In an operating room, which device would you not expect to find connected to an optical fiber cable?scalpel monitor microscope
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2. 139 views
Total internal reflection _____.causes light rays to travel in parallel lines through optical fiber allows most laser light to
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2. 164 views
What does “stimulated emission of radiation” mean?Gas particles in a laser emit photons of light when exposed to an electric
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2. 262 views
How is light amplified in a laser?Photons collide with gas particles, multiply, and reflect back and forth in a tube. Photons
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2. 150 views
What is an advantage of using a laser over a scalpel for surgery?A laser also seals blood vessels. A laser can cut through
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2. 169 views
A laser is used to make a CD or DVD by _____.cutting patterns of pits into a blank plastic disc creating a holographic surface
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2. 128 views
How is laser light different from the light produced by a flashlight?Flashlights use reflecting mirrors and lasers do not. The
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2. 168 views
A laser is used to make a CD or DVD by _____.creating a holographic surface on a plastic disc burning grooves into a blank
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2. 134 views
How is light amplified in a laser?Photons “leak” through a partially reflecting mirror, causing them to travel in step.
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2. 164 views
What does “stimulated emission of radiation” mean?Radioactive particles in a laser emit gamma rays of the same wavelength.
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2. 206 views
What is an advantage of using a laser over a scalpel for surgery?Laser surgery is much faster. A laser also seals blood vessels.
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2. 174 views
The convex lens in an optical instrument’s eyepiece _____.gathers light magnifies the image turns the image right side up
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2. 116 views
A refracting telescope uses an objective lens _____.to produce an upright image to magnify the image to view very small objects
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2. 153 views
What is the purpose of the plane mirror in a reflecting telescope?to keep the image in focus to magnify the image to gather
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2. 135 views
Optical instruments all use _____ either to magnify images or to gather and focus light.convex lenses concave lenses concave
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2. 176 views
Which instrument makes use of a concave mirror?microscope reflecting telescope refracting telescope camera
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2. 150 views
A concave lens _____.is thicker at its center than at the edges bends light rays away from the optical axis produces real and
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2. 116 views
A concave lens _____.can form real and virtual images can only form real images can only form virtual images can form images
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2. 109 views
A convex lens with an object placed closer to it than its focal point _____.forms a real image on the same side of the lens
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2. 148 views
How would you describe the image that would be produced by the concave lens in the drawing?a virtual, upside-down image at point
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2. 110 views
How would you describe the image that would be produced by the convex lens in the drawing?a real, upside-down image at point B a
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2. 176 views
In relation to the object, where is a virtual image formed with a convex and a concave lens?A. on the object side of a concave
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2. 140 views
How does a prism produce colors from white light?A prism bends different wavelengths of light by different amounts. A prism
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2. 160 views
A material with the highest index of refraction _____.reflects light the most bends light the least reflects light the least
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2. 149 views
Refract means _____.to bend to twist to bounce to reverse
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2. 85 views
.Green light has _____. a shorter wavelength than red light a shorter wavelength than violet light a longer wavelength than red
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2. 165 views
You can sometimes see a mirage because _____.white light reflects off smooth surfaces light rays can be bent by hot air light
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2. 140 views
You can sometimes see a mirage because _____.white light reflects off smooth surfaces light rays can be bent by hot air light
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2. 134 views
Green light has _____.a shorter wavelength than red light a shorter wavelength than violet light a longer wavelength than red
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2. 148 views
You can sometimes see a mirage because _____.light rays can be bent by hot air light rays can be bent by puddles asphalt roads
1. 1 answer
2. 113 views
Refract means _____.to bend to bounce to twist to reverse
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2. 78 views
A material with the highest index of refraction _____.reflects light the least reflects light the most bends light the least
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2. 132 views
How does a prism produce colors from white light?Glass changes the speed of white light, causing the colors to separate. A prism
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2. 166 views
What type of image does a plane mirror produce?real and upright virtual and upright virtual and inverted real and inverted
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2. 108 views
A transparent material _____ light.diffuses reflects transmits absorbs
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2. 116 views
What are the primary colors of light?red, yellow, blue yellow, cyan, magenta red, orange, yellow, green, blue, violet red,
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2. 141 views
What type of color is yellow?the complementary color to red a primary color of pigments a secondary color of pigments a primary
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2. 147 views
When equal amounts of all the colors of light are mixed, what is seen?black light white light secondary colors of light
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2. 174 views
How does the image produced by a plane mirror compare to the original object?It is upright and the same size as the original
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2. 103 views
What is formed when a copy of an object is formed by reflected light?an image a mirage a mirror an echo
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2. 144 views
Which type of material reflects or absorbs any light that strikes it?opaque concave transparent translucent
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2. 114 views
The color seen when a translucent object is looked at is the color it _____.reflects transmits absorbs complements
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2. 111 views
What happens when parallel rays of light hit a smooth surface?regular reflection plane reflection diffuse reflection
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2. 174 views
When the three primary colors of light are mixed, what color is seen?white purple yellow black
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2. 100 views
What is a flat sheet of glass with a silver-colored coating on one side?plane mirror plane lens concave lens convex mirror
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2. 139 views
A piece of cloth appears red under red light, green under green light, and blue under blue light. What color is the cloth?blue
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2. 140 views
Which of these materials are transparent?a car window covered in ice clear glass, water, and air a thin shade that allows some
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2. 87 views
What are the secondary colors of pigments?red, green, blue white, black, gray magenta, yellow, cyan red, yellow, blue
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2. 143 views
The image produced by a plane mirror _____.reverses up and down is larger than the object reverses left and right is smaller
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2. 105 views
The representation of light as a straight line is called a _____.beam particle wave ray
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2. 84 views
When light rays from your body are reflected in a plane mirror, _____.they are actually coming from behind the mirror your brain
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2. 111 views
A reflection is diffuse if _____.it reverses left and right it produces a virtual image it produces rays at different angles it
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2. 98 views
A virtual image is _____.an upside-down image that forms where light rays meet an image projected by a mirror onto another
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2. 117 views
Yellow, magenta, and cyan are _____.the colors of ink used in printing combined to make white light secondary colors of pigments
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2. 148 views
When two primary colors of light are combined in equal amounts, _____ is produced.white light black light a complementary color
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2. 151 views
When mixed in equal amounts, the three primary colors of pigments produce _____.black green white red
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2. 136 views
Complementary colors of light combine to make _____.white magenta yellow cyan
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2. 113 views
The color of a pigment is the color of the light _____.that it absorbs that shines through it that strikes it that it reflects
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2. 86 views
What determines the color of an opaque object?the wavelengths of light that it absorbs the color of light that strikes it the
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2. 132 views
Which type of material transmits most of the light that strikes it without scattering any?transparent opaque translucent
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2. 117 views
What determines the color of an opaque object?the color of light that passes through it the wavelengths of light that it
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2. 131 views
Which type of material absorbs light?opaque transparent translucent
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2. 126 views
Which types of materials can be used to make color filters?opaque and translucent transparent and translucent transparent and
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2. 133 views
Which type of material scatters light as it passes through?Opaque Transparent Translucent
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2. 116 views
Why is the ionosphere important to radio wave transmission?Both FM and AM waves reflect off it. AM waves reflect off it, but FM
1. 1 answer
2. 136 views
What do cell phones require to work?high-frequency microwaves the Global Positioning System satellites tuned to their wavelength
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2. 103 views
What is a neon light used for?to read X-ray negatives in operating rooms and hospitals in advertising signs and decoration to
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2. 98 views
Most of the energy of an incandescent bulb is given off as _____.electricity ultraviolet light infrared rays visible light
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2. 114 views
On AM broadcasts, what remains constant?the distance the frequency the music the amplitude
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2. 60 views
What is the frequency of something vibrating 1 million times per second?1 kilohertz 1 hertz 1 megahertz 10 hertz
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2. 137 views
In AM radio, what do the letters “A” and “M” stand for?altitude modification amplitude merging amorphous modulation
1. 1 answer
2. 117 views
What is one drawback to using tungsten-halogen bulbs?They give off a significant amount of heat. They are filled with tungsten
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2. 123 views
What do cell phones require to work?high-frequency microwaves ultraviolet rays satellites tuned to their wavelength the Global
1. 1 answer
2. 103 views
Use the diagram to answer the question.In the figure above, where does the signal start and end? The signal starts at A and ends
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2. 141 views
Which bulbs requires the most energy to produce the same amount of visible light?incandescent vapor lights tungsten-halogen
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2. 123 views
Which type of radio broadcast has a greater broadcast range, AM or FM?AM because it reflects off the ionosphere AM because it
1. 1 answer
2. 117 views
Cell phone signals are transmitted by _____ waves.ultraviolet X-ray radio infrared
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2. 94 views
How do television signals reach your TV, even though there is not a continuous wire running from the TV broadcast to your home?t
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2. 118 views
How do neon lights work?a solid is heated with electricity UV light causes powder to glow electric discharges through gases a
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2. 109 views
Why is the ionosphere important to radio wave transmission?Both FM and AM waves reflect off it. FM waves reflect off it, but AM
1. 1 answer
2. 126 views
How can broadcasting stations send their signals around the world?using X-rays using TV satellites using the Global Positioning
1. 1 answer
2. 120 views
What is a neon light used for?to read X-ray negatives to see the inside of patients’ throats in operating rooms and hospitals
1. 1 answer
2. 98 views
What kind of waves do cellular telephones use to transmit and receive signals?gamma rays microwaves infrared rays ultraviolet
1. 1 answer
2. 112 views
Most of the energy of an incandescent bulb is given off as _____.electricity infrared rays ultraviolet light visible light
1. 1 answer
2. 119 views
Satellites are not typically used for _____ signals.AM FM cell phone global positioning
1. 1 answer
2. 120 views
The first GPS was designed for use by _____.military services ships at sea commercial pilots communications companies
1. 1 answer
2. 84 views
Cell phones use _____.high-frequency microwaves Ultra High Frequency (UHF) waves AM radio waves FM radio waves
1. 1 answer
2. 161 views
The Global Positioning System used by aircraft requires information from _____ satellites.2 6 3 4
1. 1 answer
2. 109 views
You call your friend who lives in a different state. Your cell phone signal goes _____.to a hub near you to a tower and then to
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2. 132 views
The first GPS was designed for use by _____.communications companies military services ships at sea commercial pilots
1. 1 answer
2. 95 views
Satellites are not typically used for _____ signals.cell phone global positioning FM AM
1. 1 answer
2. 103 views
Which term refers to the way information is encoded into a radio signal?modulation frequency amplitude spectrum
1. 3 answers
2. 111 views
The Federal Communications Commission assigns _____ for different organizations to use.frequencies radios spectrums amplitudes
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2. 110 views
The layer of charged particles that reflects some types of radio waves is called the _____.troposphere stratosphere atmosphere
1. 1 answer
2. 92 views