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Stack #210066

* Discovery Works Ch 1

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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