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Stack #210066
* Discovery Works Ch 1
| Question | Answer |
|---|---|
| energy | is the ability to do work or cause change in matter |
| visible light | a E-M radiation that you can see |
| electro magnetic radiation | the energy given off by the sun |
| wave | a disturbance that carries energy and that travels away from its starting point. |
| vacuum | a space that is empty of any matter |
| wave length | the distance from one crest to the next crest |
| frequency | the number of waves produced |
| hertz | the unit frequency is measured |
| reflection | the bouncing back off light or water |
| plane mirror | is a flat mirror |
| concave mirror | curves inward at the middle. |
| convex mirror | curves outward in the middle |
| refraction | the bending of light as it passes from one material into another |
| lense | transparent object with at least one carved edge |
| convex lens | A lense that is thicker at the middle than at the edges and that brings light rays together. A convex lens is used to correct farsightedness. |
| concave lens | A lens that isthicker at the edges than it is in the middle and that causes light rays to spread apart. A concave lense is used to correct nearsightedness. |
| focal point | the point at which light rays passing through a lense come together. Rays of light meet at the focal point. |
| retina | light sensitive layer at back of eye on which an image is formed. The retina contains two kinds of cells. |
| contact lenses | clear, thin lenses that are placed on the eye in front of the cornea, doesn't touch eye |
| refracting telescope | an instrument for viewing distant objects that uses two lenses to gather light and produce an image |
| reflecting telescope | an instrument for viewing distant objects that uses a curved mirror at the back of its tube to ather light and produce an image |
| where is a concave mirror used? | in a reflecting telescope |
| what is the use of a concave lens? | used to correct nearsightedness |
| what is the use of a convex lens? | used to correct farsightedness |
| give an example of convex mirror | the sideview mirror of a car is a convex mirror |
| Where do rays of light meet? | They meet at the focal point. |
| How many types of cells does the retina contain? | The retina contains to types of cells. |
| refracting telescope | an instrument for viewing distant objects that uses two lenses to gather light and produce an image. The refracting telescope gave us a closer look at the Moon. |
| What telescope helped us to get a closer look at the moon? | the refracting telescope |
| reflection | the bouncing of light or sound off a surface. The reflection of sunlight off the snow made us squint. |
| reflecting telescope | an instrument for viewing distant obects that uses a curved mirror at the back of its tube to gather light and product an image. An observatory uses a reflecting telescope to observe faraway galaxies |
| transparent | letting light through; objects can be clearly seen throught transparent material. Window glass is usually transparent so that people can see through it. |
| translucent | letting light through but scattering it; objects cannot be clearly seen through translucent material. The translucent glass dimmed the room. |
| simple microscope | a microscope that uses a single lens to magnify objects. A magnifying glass is a simple microscope. |
| opaque | not letting light through. The opaque curtains kept out the sunlight |
| lens | a pice of glass or other trasparent material with at least one curved surface that brings together or spreads apart light rays passing through it. The lens in a camera focuses an image on the film. |
| electromagnetic microscope | a viewing instrument that magnifies obects thousands of times by using a beam of electrons instead of a beam of light. Doctors studied the virus through an electron microscope. |
| filter | a device that lets certain colors of light pass through while absorbing others. The stage manager placed a red filter over the spotlight. |
| compression | a region in a sound wave where particles have been pushed together. The compressions produced by a vibrating runing fork are areas of greater than normal air pressure |
| crest | the hightest point of a wave. The tope of a water wave is its crest. |
| amplitude | a measure of the amount of energy in a sound wave. The amplitude of a loud sound is greater that the amplitude of a soft sound. |
| frequency | the number of waves (such as light or sound) produced in a unit of time, such as a second. The frequency of light waves varies with the color of the light. |
| hertz | a unit used to measure wave frequency. If 100 waves are produced per second, the frequency of the wave is 100 hertz. |
| intensity | a measure of the amount of energy of sound. A sound that has high intensity is loud enough to be heard from a distance. |
| decibel | a unit used to measure the loudness or intensity of sound. Sounds that have an intensity greater than 120 decibels (db) can hurt your ears. |
| overtone | a fainter, higher tone that harmonizes with the main tone produced by a musical instrument or the human voice. The blending of overtones gives the flute its unique sound. |
| pitch | the highness or lowness of a sound. A tuba produces sounds with a low pitch. |
| octave | the series of eight notes that makes up a musical scale. |
| noise pollution | the occurrence of loud or unpleasant sound in the environment. For example, the sounds of city traffic. |
| rarefaction | a region in a sound wave where there are fewer particles than normal. The rarefactions that a vibrating violin string produces are areas of lower than normal air pressure. |
| sound | a form of energy that travels through matter as waves. The sound made the floor vibrate. |
| sound synthesizer | an electronic device that can produce a wide variety of sounds. The composer used a sound synthesizer to create new musical composition. |
| trough | the long narrow hollow between two waves. A trough occurs between two wave crests. |
| When does a trough occur? | A trough occurs between two wave crests. |
| timbre | the quality of sound that sets one voice or musical instrument apart from another. The same note played on a violin and on a trumpet differ in timbre. |
| wavelength | the distance between one crest of a wave and the next crest. Red light has a longer wavelength than blue light. |
| volume | the loudness or softness of a sound. |
| vibration | a back-and-forth movement of matter. It is the vibration of the guitar strings that produces sound. |
Created by:
Todomybest
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