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45 Cards in this Set
- Front
- Back
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Light has a dual nature...this means
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it can behave as a particle and a wave.
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What type of waves are electromagnetic waves?
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transverse waves
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Massless bundles of concentrated electromagnetic energy are: ___
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photons
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The speed of light is ____
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300,000 km/s
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A light year is
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the distance light travels in one year.
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As the frequency of a wave increases, what happens to the wavelength?
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it decreases
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List the order of the electromagnetic spectrum from longest wavelength to the shortest wavelength.
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radio waves, microwaves, infrared, visible light, UV, X-rays and gamma rays
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Light passes through materials that are ____.
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transparent
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Which has greater energy, a gamma ray or visible light?
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gamma rays...remember that energy is directly proportional to frequency
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Who was the first person to make a systematic study of color?
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Isaac Newton
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All of the colors in the rainbow make up...
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white light
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The color of an opaque object is the color of light it ___.
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reflects
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There are three additive primary colors of light. Name them.
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Red, green & blue
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What is the complimentary color of yellow?
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blue
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What is the complimentary color of cyan
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red
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What is the complimentary color of magenta?
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green
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What does yellow + blue make?
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White light
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What does magenta + green make?
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White light
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What does cyan + red make?
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White light
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Why is the sky blue?
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It's tiny particles scatter high-frequency light. Violet light is scattered the most, but our eyes don't see violet well, so we see a blue sky.
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Why are sunsets red?
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By the time a beam of light gets to the ground at sunset, all of the high frequency light has already been scattered. Only the lower frequencies, remain resulting in a red sunset.
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When a wave reaches a boundary between two media, usually some or all of the wave bounces back into the first medium. This is called ___.
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Reflection
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The Law of Reflection states:
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The angle of incidence and the angle of reflection are equal to each other.
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What kinds of images do plane mirrors produce? Real or virtual?
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Virtual
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How can I see more of myself in a flat, plane mirror?
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Buy a bigger mirror!
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In a plane mirror, where exactly is the image?
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As far behind the mirror as I am in front of it.
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In a plane mirror, is the image the same size as the object, or it is bigger or smaller?
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Same size
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What happens in diffuse reflection?
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Light reflects at various angles since the surface isn't smooth.
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When a wave that is traveling at an angle changes its speed upon crossing a boundary between two media it bends. This is called___.
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Refraction
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Where is the image located in a convex mirror?
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Behind the mirror
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Where is the image located in a convace mirror?
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Can be located in front or behind the mirror depending on the location of the object.
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What types of images do convex mirrors produce?
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Virtual images
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What types of images do concave mirrors produce?
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Real or virtual, depending on where the object is located.
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When light travels from a liquid to a gas, it bends. Which way will it bend? (Toward normal or away from normal)
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Away from the normal (SFA)
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When light travels from a less dense medium to a more dense medium it bends. How will the light bend once it crosses the boundary of the mediums? (Toward the normal or away from the normal)
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Towards the normal (FST)
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The color of an object we see is determined by...
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The color of light it reflects.
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When a red rose with a green stem is illuminated with red light, the stem will look what color?
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Black (Green light isn't in the source!)
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Why are clouds white?
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Tiny water droplets acts as prisms and scatter light of different colors.
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Do electromagnetic waves need a medium to travel in?
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No.
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How long does it take for light to reach the earth from the sun?
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8 minutes.
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Is sound an electromagnetic wave?
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No (Sound is a longitudinal wave and all electromagnetic waves are transverse.)
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Light travels slowest in what type of medium?
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Solid
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What is the orientation of a virtual image?
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Upright
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What is the orientation of an image in a plane flat mirror?
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Upright
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Can your image be inverted when looking at yourself in a concave mirror?
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Yes
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