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50 Cards in this Set
- Front
- Back
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Sounds are caused by v______.
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vibrations
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Do sound waves require a medium to travel?
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Yes
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Waves that require a medium are called m________ waves.
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mechanical
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Sound waves oscillate parallel to the direction in which they travel. Therefore, sound waves are l_________ waves.
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longitudinal
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Waves that oscillate at 90 degrees to the direction in which they travel are called ____ waves.
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transverse
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Water waves and light waves are which type of waves -- longitudinal or transverse?
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transverse
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Light waves are which type of waves -- mechanical or electromagnetic?
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electromagnetic
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Do electromagnetic waves require a medium to travel?
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No
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What mnemonic device helps remember the order of the electromagnetic waves?
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ERMIVUXGC
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What speed do electromagnetic waves travel in a vacuum?
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light speed: 3 x 10^8 m/s
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What speed do sound waves travel at 0 degrees C?
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about 330 m/s
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What happens to the speed of sound waves as the temperature increases?
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Speed increases also
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In which medium is sound fastest -- gas, liquid, solid?
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solid
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If two identical sound waves are made to be 1/2 wavelength out of phase, what will happen to the sound?
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It will disappear; destructive interference will occur as crests superimpose on troughs
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A "crest" on a longitudinal wave is a ____.
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compression
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A "trough" on a sound wave is an ____.
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Expansion
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As a longitudinal wave passes through a medium, will any object in its path be moved to a new location?
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No. The object will be moved forward, then backward and then placed back to the original spot.
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Will a transverse wave, such as water, move an object forward?
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No. The object will be moved up and down and then put back at original spot.
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When a pipe is has a closed end and a standing sound wave is formed in it, how much of the sound wave's wavelength will fit in that pipe?
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1/4 wavelength
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When an open pipe is made to have an standing sound wave in it, how much of the sound wave's wavelength will fit in that pipe?
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1/2 wavelength
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If a pipe is made to be closed at one end while a sound wave is made in it, what happens to the sound when the pipe is opened?
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The pitch or frequency increases by an octave
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When sound pitch or frequency goes up by an octave, how much does the frequency increase?
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frequency doubles
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When pitch goes down an octave, how much does frequency decrease?
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It halves.
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The next octave up from C 256 Hz is ____ Hz.
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512
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Another word for pitch is ___.
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frequency
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The primary light colors are....
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red, blue, green
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The primary pigment colors are...
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cyan, magenta, yellow
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When two primary colors are blended together, you get a ____ color
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secondary
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Red + blue light =
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magenta light
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Red light + green light =
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yellow light
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Blue light + green light =
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cyan light
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Red light + blue light + green light =
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white light
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Magenta + cyan + yellow pigments =
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black pigment
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A plant appears green because it reflects ____ light and absorbs ____ and ____ light.
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green
red and blue |
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Blue and yellow are _____ light colors. So are magenta & green and red & cyan.
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complementary
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When complementary light colors are blended together, ___ light results.
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white
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If green light shines on a red apple, the apple will appear ___ because the apple can only reflect red.
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black
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If yo see yellow on a soap film, then you actually are only seeing ___ and ___ light because blue was cancelled due to ____ interference
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red, green
destructive |
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When a color is cancelled in thin films, it is because the thickness of the film is _____ (fraction??) of the wavelength of the cancelled color.
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1/4
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The cancellation of a color in thin films is caused by the ___ of light from the surface of the film and the inside back edge of the film.
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reflections
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Which color of light is cancelled in a thin film when you only see magenta?
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green
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Which color of light is cancelled in a thin film when you only see cyan?
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red
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A sound reflection is called an ____.
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echo
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When a sound is moving toward you, what happens to the frequency and wavelength, according to the Doppler shift?
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frequency increases
wavelength decreases |
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When a wave is moving away from you, what happens to the frequency and wavelength, according to the Doppler shift?
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frequency decreases
wavelength increases |
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In Doppler shift, which variable does not change -- speed, frequency, wavelength?
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speed of the wave
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If a sound source moves much faster than the sound moves, a___ ____ will result.
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sonic boom
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When a boat moves faster than the waves it makes a ___ ___ will result.
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bow wave
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When a C 256 is played with a C 259, ___ beats will be heard every second.
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3
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When beats are heard from two close sounds played together, it is caused by....
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alternating sections of constructive and destructive interference.
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