Color & Light
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The color of an object that we see is determined by
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all of the above
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Sunlight contains all colors of light, but much of it is
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yellow
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Earth receives a lot of ultra violet radiation from the sun. Most of it doesn't reach the ground because it is
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scattered by the upper atmosphere
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Humans are most sensitive to light that is
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yellow-green
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Light shines on a pane of green glass and a pane of clear glass. The temperature will be higher in
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the green glass
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Colors seen on TV result from color
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addition
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Colors seen on a photograph result from color
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subtraction
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A tennis ball is most easily seen if it's color is
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yellow-green
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Different colors of light correspond to different light
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frequencies
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Complementary colors are two colors that
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produce white light when added together
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When blue and yellow paints are mixed together, the result is green. The reason for this is that
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between blue and yellow pigments, all colors are absorbed except green
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The three paint colors that are useful for color subtraction are
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magenta, cyan, and yellow
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Magenta light is really a mixture of
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red and blue night
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The color of an opaque object is determined by the light that is
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reflected
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A sheet of red paper will look black when illuminated with
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cyan light
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If sunlight were green instead of white, the most comfortable color to wear would be
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green
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If the molecules in the sky scattered orange light instead of blue light, sunsets would be colored `
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blue
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The sky is blue because air molecules in the sky act as tiny
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resonators that scatter blue light
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The reason the sky is blue is that air molecules
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absorb and then re emit blue light, scattering it in all directions
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Sunsets are red because
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blue light from the sun is scattered by the Earth's atmosphere
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Clouds are white because
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water molecules of different sizes form clusters, scattering different colors of light
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The true color of water is
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sky blue
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The cyan color of ocean water is evidence that the water absorbs
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red
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When a sample of an element is heated until it glows, the color it gives off is
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a composite of many frequencies of light
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The colors of light emitted by incandescent gases show the
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identities of atoms in the gas
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Spectral lines in a line spectrum take the shape of lines because the
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slit of the spectroscope is itself a line opening
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The three primary colors of light for additive color mixing are
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red, green, and blue
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When red and green light shine on a white sheet, the resulting color is
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yellow
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When red and blue light shine on a white sheet, the resulting color is
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magenta
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The complementary color is blue is
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yellow
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The colored dots that make up the color on a TV screen are
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red, blue, and green
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A photograph of your favorite person's yellow sweater shows as what color on the negative?
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blue
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The complementary color is green is
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magenta
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Electromagnetic waves are
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transverse
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Electromagnetic waves can
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travel through a vaccum
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Which of these electromagnetic waves has the shortest wavelength?
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X-rays
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Compared to the wavelength of ultraviolet waves, the wavelength of infrared waves is
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longer
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Compared to the velocity of radio waves, the velocity of visible light waves is
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the same
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The source of all electromagnetic waves is
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none of the above
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Which of the following are fundamentally different from the other?
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sound waves
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The main difference between a radio wave and a light wave is it's
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none of the above
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The main difference between a radio wave and a sound wave is its
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basic nature
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Which of the following is NOT an electromagnetic wave?
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sound
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Compared to it's speed in air, the speed of light in water is
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faster
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Glass is transparent to visible light but not to
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ultraviolet & infrared
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The shiny surfaces of metals have most to do with
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the free electrons in metal atoms
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Electromagnetic waves with higher frequencies have wavelength that are
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shorter
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The shadow produced by an object held close to a piece of paper in sunlight will be
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sharp
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Light waves are
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transverse
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What is the ultimate source of electromagnetic waves?
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vibrating charged particles
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The primary purpose of polarized sunglasses is
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to block glare from reflections
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Light does not pass through what kind of materials?
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opaque
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How far is a light second?
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300,000 km/s
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Light that reflects at glancing angles from nonmetallic surfaces, such as glass, water, or roads is
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polarized perpendicular to the surface
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Light reflected from a lake surface is polarized
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horizontally
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If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having
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frequency of 1000 HZ
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What is the wavelength of an electromagnetic wave that has a frequency of 1 HZ?
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More than 1m
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What is the frequency of an electromagnetic wave having a wavelength of 300,000 km?
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1 Hz
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After randomly polarized light passes through a polarizer, it is
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totally polarized
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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 were parallel is
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zero
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Perception of depth is given by
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the combination of views in the eye-brain system
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Material in an object that selectively absorbs colored light is called a pigment.
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True
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Two color of light that add together to form black light are called complementary colors.
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False
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The sky is blue because air molecules absorb blue light.
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False.
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A spectroscope is an instrument that analyzes the colors in a light beam.
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False.
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Some electrons in atoms vibrate at a characteristic frequency that produces white light.
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False.
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Tennis balls are yellow-green because our eyes are most sensitive to that color.
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True.
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If an object were completely black, you wouldn't be able to see it directly.
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True.
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According to Einstein, light consists of massless bundles of electromagnetic energy called photons.
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False.
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Energy emitted by vibrating electric charges is carried by electromagnetic waves.
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True.
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Materials that allow light to pass through them in straight lines are called opaque materials.
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False.
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A thin beam of light is called an X-ray.
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False
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A total shadow is called an umbra.
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True.
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Polarization occurs when waves vibrate in a single direction.
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True.
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Light sometimes acts as a wave and sometimes as a particle.
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True.
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Glass transmits ultraviolet and visible light waves but not infrared waves.
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False.
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The distance light travels in one year is called a light-year.
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True.
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Electromagnetic heat waves are called ultraviolet waves.
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False.
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Infrared waves are responsible for sunburn.
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False.
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Vision in three dimensions depends on the fact that both eyes give impressions simultaneously, each eye viewing a scene from the save angle.
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False.
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Why are objects a certain color?
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objects appear to have color since they are able to selectively absorb and reflect certain wavelengths of visible light
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How does colored glass emit and absorb light?
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By adding \"impurities\". Glass by itself is transparent (to visible light). The minerals added absorb some colors leaving out others, which are then transmitted. This looks like as if the glass itself is colored.
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what is a line spectrum?
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an emission spectrum consisting of separate isolated lines. an emission (of light, sound, or other radiation) composed of a number of discrete frequencies or energies.
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what waves are in the electromagnetic spectrum?
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Radio waves, gamma-rays, visible light, and all the other parts of the electromagnetic spectrum are electromagnetic radiation. Electromagnetic radiation can be described in terms of a stream of mass-less particles, called photons, each traveling in a wave-like pattern at the speed of light.
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polarization
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n) is a property of waves that can oscillate with more than one orientation. Electromagnetic waves such as light exhibit polarization, as do some other types of wave, such as gravitational waves.
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why is water blue?
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Clean water appears blue in white-tiled swimming pools as well as in indoor pools where there is no blue sky to be reflected. The deeper the pool, the bluer the water. Scattering from suspended particles also plays an important role in the color of lakes and oceans.
