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### 50 Cards in this Set

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