| 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. The sounds of city traffic are a form of noise pollution. |
| 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. |
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