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CSA 3 6th grade Sci
Waves
| Question | Answer |
|---|---|
| mechanical wave | involve the motion of some form of matter, but the matter is vibrating in place |
| electromagnetic wave | these waves send energy through magnetic and electric fields. They have wave length and a frequency, and can travel through a vacuum. |
| transverse wave | the particles of the medium move in a direction that is perpendicular to the direction in which the energy moves. example: ocean wave |
| longitudinal wave | energy compresses and expands the space between particles. example: sound wave |
| sound wave | the particles of the medium carrying the sound move back and forth parallel to the direction the energy travels. They travel fastest through solids. |
| peak, or crest, of a transverse wave | the top of the wave |
| bottom, or trough, of a transverse wave | is the minimum height that a wave reaches below the surface of the surrounding water |
| compressions | Areas of a longitudinal wave where particles are most tightly bunched together |
| rarefactions | The areas where particles are spread apart the most |
| frequency | the number of waves that pass a certain point in a given amount of time. |
| method of measuring frequency | by counting the number of peaks or compressions that pass a certain point over a given time. |
| frequency of a sound wave | determines the pitch you will hear. |
| wavelength | the distance between successive corresponding points on a wave. |
| method of measuring wavelength | distance between successive corresponding points on a wave, or the distance between two successive crests of a wave. |
| visible light, wavelength determines | what color the light is |
| measuring longitudinal waves | the distance between one compression and another |
| amplitude | relates to the amount of energy the wave carries |
| transverse wave, amplitude | the distance from the midline of the wave to its greatest height, or crest, or from the midline of the wave to its lowest point, or trough. |
| sound waves, amplitude | corresponds to volume or loudness |
| interference | Two or more waves that travel in the same medium interacting with each other. |
| constructive interference | If two waves that meet have similar frequencies and are in phase the wave amplitudes will add up to create new waves with a greater amplitude |
| destructive interference | If the two waves are completely out of phase, a new wave with a lower overall amplitude will result. |
| seismographs | used in three different locations to pinpoint an earthquake's epicenter |
| convex lens | when light rays pass through _________________they come together |
| concave | when light rays pass through_________________ they spread out |
| Triangular Prism | When white light pass through, a rainbow of light is seen on the opposite side because the light changes direction when it enters the ______________. |
| refraction of light | the bending of light waves |
| focal point | where light rays meet when they are refracted by a lens |
| examples of a convergent lens | convex lenses, magnifying glass, microscope lens |
| examples of a divergent lens | concave lenses, nearsighted glasses, car headlamp cover |
| convergent lens | light rays to come together from the lens; image appears larger |
| divergent lens | light rays spread out from the lens; image can appear smaller |
| nearsighted | vision is blurry, focal point behind retina; difficulty reading in arms reach; convex lenses |
| farsighted | vision is blurry; focal point in front of retina; difficulty reading far away; concave lenses |
| reflection | the bouncing of a wave off an object, changing its direction of travel |
| absorption | to take in matter or energy; a wave will be taken in by an object and not pass through it |
| transmission | movement of material or energy from one location to another; a wave will pass through an object |
| diffraction | the bending of light or sound waves around obstacles in its path |
| the higher the vibrations per second | the higher the pitch |
| order of wavelengths from longest to shortest | radio, infrared, visible light, ultra violet, x-rays, gamma rays |
| Ultraviolet light advantages | sterilize lab material, destroy harmful cells, absorbed by skin, create vitamin D |
| Ultraviolet light disadvantages | destroy cells, break down DNA, absorbed by skin, degrades plastic |
| rough surfaces affect on light | scatter light rays |
| diffuse reflection | rock, running stream, tee shirt |
| surface reflection | car, mirror, calm water |
| translucent | describes materials that allow some light to travel through them, but not enough to see through the material |
| transparent | describes materials through which light can travel; materials that can be seen through |
| opaque | describes an object that light cannot travel through |
Created by:
ledee.workman
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