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9Sci CH19

9th Science CH19 Light

diffraction the bending of waves around a barrier
diffraction grating a piece of glass or plastic with many parallel slits that acts like a prism, causing white light that passes through it to separate into its component colors (the visible spectrum)
electromagnetic radiation transverse waves that transfer energy by radiation; vary in length from very long radio waves to extremely short gamma waves
fluorescent light light produced when ultraviolet radiation inside a fluorescent light bulb causes its fluorescent coating to glow; uses less energy than incandescent bulbs
gamma ray high-frequency electromagnetic waves that travel at the speed of light, have no mass or charge, and are the most penetrating form of radiation
incandescent light light produced by a thin tungsten wire, or filament, that is heated until it glows
infrared radiation electromagnetic waves that have a wavelength slightly longer than visible light; indicates the presence of heat
microwave radio waves with the highest frequency and energy; used in communications and microwave ovens
modulation process of adding voice, music, video, computer information, or other data to radio waves by using electrical currents to vary either amplitude or frequency
opaque material materials you can’t see through because they absorb or reflect all light
photon a tiny particle-like bundle of radiation
pigment colored material that absorbs some colors and reflects others; the colors of pigments are determined by the colors they reflect
radio wave electromagnetic waves that have long wavelengths (low frequencies); radio waves are used in communications
reflection occurs when a wave strikes an object and bounces off
refraction the bending of waves, caused by changing their speed
translucent material materials that can be hazily seen through because they allow some light to pass through them
transparent material materials that can be clearly seen through because they allow light to pass through them
ultraviolet radiation electromagnetic waves that have a higher frequency than visible light; abbreviated UV
visible radiation electromagnetic waves in the only part of the electromagnetic spectrum that we can see--light
X-ray electromagnetic waves having a wavelength shorter (higher frequency) than ultraviolet radiation; often used in medical diagnosis and photography because they can penetrate human tissue