2291303
Descripción
Test por Olivia Gibbs, actualizado hace más de 1 año
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Creado por Olivia Gibbs
hace más de 9 años
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Pregunta 1
Pregunta
What is the ultimate source of electromagnetic waves?
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TV antennas
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Vibrating atoms
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Vibrating molecules
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Vibrating charged particles
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Radio sets
Pregunta 2
Pregunta
If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a
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speed of 1000 m/s.
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wavelength of 1000 m.
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period of 1000 s.
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frequency of 1000 Hz.
Pregunta 3
Pregunta
Compared to the velocity of radio waves, the velocity of visible light waves is
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-
faster.
-
slower.
-
the same.
Pregunta 4
Pregunta
The main difference between a radio wave and a light wave is its
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speed.
-
wavelength.
-
speed and wavelength.
-
none of the above.
Pregunta 5
Pregunta
Compared to its speed in air, the speed of light in water is
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-
the same.
-
faster.
-
slower.
Pregunta 6
Pregunta
Which of the following are fundamentally different from the others?
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X-rays
-
Radio waves
-
Gamma rays
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Sound waves
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Light waves
Pregunta 7
Pregunta
Which of these electromagnetic waves has the shortest wavelength?
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X-rays
-
Light waves
-
Infrared waves
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Radio waves
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Ultraviolet waves
Pregunta 8
Pregunta
If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes
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for light to travel from the sun to Earth.
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to operate receiving equipment in the dark.
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for the sun to disappear.
-
all of the above.
-
none of the above.
Pregunta 9
Pregunta
After randomly polarized light passes through a polarizer, it is
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totally blocked.
-
partially polarized.
-
totally polarized.
-
randomly polarized.
Pregunta 10
Pregunta
The source of all electromagnetic waves is
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-
vibrating charges.
-
electric fields.
-
magnetic fields.
-
heat.
-
none of the above.
Pregunta 11
Pregunta
Clouds
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block UV light.
-
neither block nor transmit UV light.
-
transmit UV light.
Pregunta 12
Pregunta
Light that reflects at glancing angles from nonmetallic surfaces, such as glass, water, or roads is
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randomly polarized.
-
polarized parallel to the surface.
-
polarized perpendicular to the surface.
Pregunta 13
Pregunta
Light does not pass through what kind of materials?
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Transparent
-
Opaque
-
Neither transparent nor opaque
Pregunta 14
Pregunta
Solar eclipses are seen less commonly than lunar eclipses because
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the sun is so much larger than the moon.
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the sun is farther from Earth than is the moon.
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Earth's shadow on the moon is larger than the moon's shadow on Earth.
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solar eclipses don't happen as often as lunar eclipses.
-
none of the above.
Pregunta 15
Pregunta
How far is a light-second?
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18,000,000 km
-
9,000,000 km
-
5,000 km
-
300,000 km
-
95,000,000,000 km
Pregunta 16
Pregunta
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
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-
zero.
-
twice as much.
-
half as much.
-
the same.
Pregunta 17
Pregunta
The shiny surfaces of metals have most to do with
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a resonant frequency of electrons in the metal.
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the fact that light reflects from metals.
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metals; relatively high density.
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the free electrons in metal atoms.
Pregunta 18
Pregunta
Electromagnetic waves are
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longitudinal waves.
-
transverse waves.
Pregunta 19
Pregunta
Glass is transparent to visible light, but not to
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infrared.
-
ultraviolet.
-
infrared and ultraviolet.
-
none of the above.
Pregunta 20
Pregunta
Compared to the wavelength of ultraviolet waves, the wavelength of infrared waves is
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shorter.
-
longer.
-
the same.
Pregunta 21
Pregunta
Heat lamps give off mostly
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-
X-rays.
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infrared waves.
-
radio waves.
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ultraviolet waves.
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microwaves.
Pregunta 22
Pregunta
Electromagnetic waves with higher frequencies have wavelengths that are
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shorter.
-
longer.
Pregunta 23
Pregunta
An ideal polarizing filter will transmit 50% of non-polarized light incident on it. How much light is transmitted by two ideal polarizing filters that are oriented with their axes parallel to each other?
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50%
-
Between 50% and 100%
-
Between 0% and 50%
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0%
-
100%
Pregunta 24
Pregunta
Electromagnetic waves
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can travel through a vacuum.
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need a medium to travel through.
Pregunta 25
Pregunta
Light reflected from a lake surface is polarized
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randomly.
-
vertically.
-
horizontally.
Pregunta 26
Pregunta
Which of the following is NOT an electromagnetic wave?
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Light
-
Infrared
-
X-ray
-
Sound
-
Radio
Pregunta 27
Pregunta
What is the frequency of an electromagnetic wave having a wavelength of 300,00 km?
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Less than 1 Hz
-
More than 1 Hz
-
1 Hz
Pregunta 28
Pregunta
Electromagnetic waves
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need a medium to travel through.
-
can travel through a vacuum.
Pregunta 29
Pregunta
What is the wavelength of an electromagnetic wave that has a frequency of 1 Hz?
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1 m
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Less than 1 m
-
More than 1 m
Pregunta 30
Pregunta
The primary purpose of polarized sunglasses is
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to block ultraviolet rays.
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to block infrared rays.
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to block glare from reflections.
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to look cool.
Pregunta 31
Pregunta
Because of absorption, a polarizing filter will actually transmit 40% of incident non-polarized light. Two polarizing filters with their axes aligned will transmit
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0%.
-
between 0% and 40%.
-
40%.
-
between 40% and 100%.
-
100%.
Pregunta 32
Pregunta
Infrared waves are responsible for sunburn.
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- True
- False
Pregunta 33
Pregunta
A thin beam of light is called an X-ray.
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- True
- False
Pregunta 34
Pregunta
Glass transmits ultraviolet and visible light waves but not infrared waves.
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- True
- False
Pregunta 35
Pregunta
The distance light travels in one year is called light-year.
Respuesta
- True
- False
Pregunta 36
Pregunta
Materials that allow light to pass through them in straight lines are called opaque materials.
Respuesta
- True
- False
Pregunta 37
Pregunta
Polarization occurs when waves vibrate in a single direction.
Respuesta
- True
- False
Pregunta 38
Pregunta
Energy emitted by vibrating electric charges is carried by electromagnetic waves.
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- True
- False
Pregunta 39
Pregunta
A total shadow is called an umbra.
Respuesta
- True
- False
Pregunta 40
Pregunta
Light sometimes acts as a wave and sometimes as a particle.
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- True
- False
Pregunta 41
Pregunta
According to Einstein, light consists of massless bundles of electromagnetic energy called photons.
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- True
- False
Pregunta 42
Pregunta
Electromagnetic heat waves are called ultraviolet waves.
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- True
- False
Pregunta 43
Pregunta
The color of an object we see is determined by the
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colors of light reflected by the object.
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frequencies of light absorbed by the object.
-
colors of light shining on the object.
-
frequencies of light reflected by the object.
-
all of the above.
Pregunta 44
Pregunta
Sunlight contains all colors of light, but much of it is
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orange.
-
blue.
-
violet.
-
yellow.
-
red.
Pregunta 45
Pregunta
Light shines on a pane of green glass and a pane of clear glass. The temperature will be
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higher in the clear glass.
-
higher in the green glass.
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the same in each.
Pregunta 46
Pregunta
Colors seen on TV result from color
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subtraction.
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addition.
-
none of the above.
Pregunta 47
Pregunta
Different colors of light correspond to different light
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frequencies.
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polarities.
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intensities.
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velocities.
-
none of the above
Pregunta 48
Pregunta
When blue and yellow paints are mixed together, the result is green. The reason for this is that
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blue and yellow are complementary colors.
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yellow pigments absorb green light and reflect all the others.
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blue reflects only blue light, and yellow reflects almost all colors of light.
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between blue and yellow pigments, all colors are absorbed except green.
-
blue absorbs yellow light and yellow absorbs blue light.
Pregunta 49
Pregunta
Magenta light is really a mixture of
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red and yellow light.
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red and cyan light.
-
yellow and green light.
-
red and blue light.
-
none of the above
Pregunta 50
Pregunta
The color of an opaque object is determined by the light that is
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-
absorbed.
-
reflected.
-
transmitted.
-
all of the above
-
none of the above
Pregunta 51
Pregunta
If sunlight were green instead of white, the most comfortable color to wear on a hot day would be
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-
yellow.
-
blue.
-
green.
-
magenta.
-
none of the above
Pregunta 52
Pregunta
If molecules in the sky scattered orange light instead blue light, sunsets would be colored
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-
yellow.
-
blue.
-
green.
-
orange.
-
none of the above
Pregunta 53
Pregunta
If the atmosphere were 50 times thicker than it now is, the sun would appear
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-
blue-violet.
-
orange-green.
-
red-orange.
-
green-blue.
-
none of the above
Pregunta 54
Pregunta
The reason the sky is blue is that air molecules
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-
are blue.
-
reflect blue light.
-
absorb yellow light.
-
absorb and then reemit blue light, scattering it in all directions.
-
absorb green light.
Pregunta 55
Pregunta
Sunsets are red because
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-
the longest path of sunlight through the atmosphere is at sunset or sunrise.
-
a lot of high-frequency light is scattered by the atmosphere.
-
blue light from the sun is scattered by Earth's atmosphere.
-
all of the above
-
none of the above
Pregunta 56
Pregunta
The true color of water is
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-
clear.
-
greenish blue.
-
sky blue.
-
green.
-
white.
Pregunta 57
Pregunta
The cyan color of ocean water is evidence that the water absorbs
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-
yellow.
-
green.
-
orange.
-
blue.
-
red.
Pregunta 58
Pregunta
When a sample of an element is heated until it glows, the color it gives off is
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-
a continuous band of color.
-
a composite of many frequencies of light.
-
a single frequency of light.
Pregunta 59
Pregunta
The colors of light emitted by incandescent gases show the
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-
absorbing qualities of gas.
-
polarization of atoms in the gas.
-
relative masses of atoms in the gas.
-
identities of atoms in the gas.
Pregunta 60
Pregunta
The three primary colors of light for additive color mixing are
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-
red, green, and blue.
-
yellow, green, and blue.
-
red, yellow, and blue.
-
red, yellow, and green.
-
yellow, cyan, and red.
Pregunta 61
Pregunta
When red and green light shine on a white sheet, the resulting color is
Respuesta
-
blue.
-
green.
-
yellow.
-
magenta.
-
cyan.
Pregunta 62
Pregunta
The complementary color of blue is
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-
yellow.
-
cyan.
-
violet.
-
green.
-
magenta.
Pregunta 63
Pregunta
The colored dots that make up the color on a TV screen are
Respuesta
-
red, blue, and yellow.
-
red, blue, and green.
-
magenta, cyan, and yellow.
-
red, green, and yellow.
-
yellow, blue, and green.
Pregunta 64
Pregunta
Spectral lines in a line spectrum take the shape of lines because the
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-
atoms that emit the light vibrate along parallel lines.
-
light emitted aligns with the gravitational field.
-
slit of the spectroscope is itself a line opening.
-
light is polarized.
Pregunta 65
Pregunta
A photograph of your favorite person's yellow sweater shows as what color on the negative?
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Green
-
Orange
-
Red
-
Blue
-
Yellow
Pregunta 66
Pregunta
Material in an object that selectively absorbs colored light is called a pigment.
Respuesta
- True
- False
Pregunta 67
Pregunta
Two colors of light that add together to form black light are complementary colors.
Respuesta
- True
- False
Pregunta 68
Pregunta
A spectroscope is an instrument that analyzes the colors in a light beam.
Respuesta
- True
- False
Pregunta 69
Pregunta
Some electrons in atoms vibrate at a characteristic frequency that produces white light.
Respuesta
- True
- False
Pregunta 70
Pregunta
If an object were completely black, you wouldn't be able to see it directly.
Respuesta
- True
- False
Pregunta 71
Pregunta
If you're looking for an instrument that tells what stars are made of, look for a
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-
spectroscope.
-
telescope.
-
stellar microscope.
-
stethoscope.
Pregunta 72
Pregunta
The complementary color of green is
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-
red.
-
magenta.
-
green.
-
yellow.
-
cyan.
Pregunta 73
Pregunta
A sheet of red paper will look black when illuminated with
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-
cyan light.
-
red light.
-
magenta light.
-
yellow light.
-
none of the above
Pregunta 74
Pregunta
The white caps of waves as they overturn are evidence that the water has
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-
broken into an assortment of tiny particles that scatter all colors.
-
lost its transparency.
-
absorbed back
-
reflected red, green, and blue light.
Pregunta 75
Pregunta
Humans are most sensitive to light that is
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-
yellow-green.
-
white.
-
green-blue.
-
red.
-
black.
Pregunta 76
Pregunta
A tennis ball is most easily seen if its color is
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-
black.
-
violet.
-
yellow-green.
-
white.
Pregunta 77
Pregunta
When red and green light shine on a white sheet, the resulting color is
Respuesta
-
green.
-
blue.
-
yellow.
-
cyan.
-
magenta.
Pregunta 78
Pregunta
Earth receives a lot of ultraviolet radiation from the sun. Luckily most of it does't reach the ground, because it is
Respuesta
-
scattered by the upper atmosphere.
-
absorbed by a protective layer of ozone gas in the upper atmosphere.
-
absorbed by the large amount of air in the atmosphere.
-
Actually, there isn't enough UV radiation coming from the sun to harm us.
Pregunta 79
Pregunta
The sky is blue because air molecules in the sky act as tiny
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-
resonators that scatter blue light.
-
mirrors that reflect only blue light.
-
sources of white light.
-
prisms.
-
none of the above
Pregunta 80
Pregunta
The three paint colors that are useful for color subtraction are
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-
red, green, and blue.
-
magenta, cyan, and yellow.
-
red, blue, and yellow.
-
magenta, cyan, and red.
-
magenta, green, and yellow.
Pregunta 81
Pregunta
Complementary colors are two colors that
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-
are next to each other on the color chart.
-
produce white light when added together.
-
look good together.
-
are primary colors.
-
none of the above
Pregunta 82
Pregunta
The sky is blue because air molecules absorb blue light.
Respuesta
- True
- False
Pregunta 83
Pregunta
Tennis balls are yellow-green because our eyes are most sensitive to that color.
Respuesta
- True
- False
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