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50 Cards in this Set
- Front
- Back
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transverse wave
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molecules of the medium vibrate at right angles to the direction of motion of the wave
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longitudinal
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molecules of the medium move parallel to the direction of motion of the wave
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pulse wave
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single disturbance
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periodic wave
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continuous discturbance
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crest
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high point of a transverse wave
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trough
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low point of a transverse wave
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amplitude
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distance molecules are disturbed
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frequency
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numbers of complete vibrations that pass a point per unit time
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period
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time for once complete wave
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how speed of a wave is determined
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medium it travels through
1. sound waves travel faster through solids than through gases 2. water waves travel faster in deep water than in shallow 3. light waves travel faster in air than in glass |
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reflection
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light bounces off a barrier
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refraction
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waves change speed when the medium changes, which changes wavelength
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diffraction
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waves spread out when they reach a narrow opening or corner
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interference
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two waves passing adjacent corners or passing through narrow slits will superimpose each other
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constructive interference
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if the two waves meet crest to crest and trough to trough they will get larger
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destructive interference
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if the two waves meet crest to trough they will cancel each other out
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Unit for sound intensity
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watts/m^2
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human hearing range
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20-20,000 Hz
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standing wave
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a wave pattern that results when 2 waves of the same frequency and amplitude travel in opposite directions and interfere.
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transparent
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light passes through and objects can be seen through it
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translucent
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light passes through it but is scattered, cannot see objects clearly
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opaque
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light is absorbed
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lenses
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curved piece of glass or plastic use refraction to create an image
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inventor of microscope
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Galileo
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found light to be a wave
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Young
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chromatic aberration
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some lenses can disperse light into its colors
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spherical aberration
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some lenses do not focus light well that hits close to the edges of the lens
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superimpose
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two waves meet in space
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believed light was a particle
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Newton
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nodes
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points on a standing wave that don't move
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concave
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lens that gives same image as convex mirror
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invented reflecting telescope
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Newton
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polarized
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light is transmitted in only 1 plane
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unit for sound intensity
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decibels
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violet
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color with most energy
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red
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color with least energy
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speed of sound in air
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343 m/s
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electromagnetic wave
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a wave with electric in one plane and magnetic in the plane perpendicular (light)
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dispersion
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breaking of light into its colors
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founder of dispersion
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Newton
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inventor of compound microscope
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Galileo
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unit for frequency
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Hertz
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believed light was a wave
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Huygens
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Doppler Effect
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the change in frequency detected by an observer because the sound source and the observer have different velocities with respect to the medium of sound propagation
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antinodes
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place of maximum vibration in a standing wave
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resonance
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frequency of a vibrating force exactly matches a natural frequency to the object which the force is applied
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electromagnetic spectrum
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the series of electromagnetic waves, arranged in order of their frequencies or wavelengths
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virtual image
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image from which all the rays of light do not actually come but only appear to do so
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real image
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image from which all the rays actually do emanate
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plane mirror
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forms an upright, virtual image that is located as far behind the mirror as the object is in front of it
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