Weegy: The process in which a substance changes from a gaseous state to the liquid state is condensation. (More)

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Weegy: The velocity of light is greatest in AIR. User: Which one of the following scientists did not study the properties of light? A. Einstein B. Maxwell C. Newton D. Kepler Weegy: Kepler did not study the properties of light. User: The glow emitted by a substance exposed to external radiation is called A. fluorescence. B. phosphorescence. C. bioluminescence. D. luminescence. Weegy: The glow emitted by a substance exposed to external radiation is called Fluorescence. User: Rays of light incident on a lens and parallel to the principal axis of the lens converge A. in front of the lens. B. in back of the lens. C. at the focal point of the lens. D. at the center of curvature of the lens. Weegy: Rays of light incident on a lens and parallel to the principal axis of the lens converge - at the focal point of the lens. User: The portion of a light ray that falls on a surface is a/an A. reflected ray. B. specular reflection. C. diffuse reflection. D. incident ray. Weegy: Portion of light ray that falls on a surface is incident ray. User: If a 72-candela light source is located at a distance of 3 meters from a surface, the illuminance on the surface is A. 24 lux. B. 8 lux. C. 216 lux. D. 648 lux. (More)

Weegy: The original pattern of the light is distorted, this occurs when light is reflected from a rough or unpolished surface. User: When an object is placed 8 millimeters from a concave spherical mirror, a clear image can be projected on a screen 16 millimeters in front of the mirror. If the object has a height of 4 millimeters, the height of the image is A. 4 millimeters. B. 2 millimeters. C. 8 millimeters. D. 12 millimeters. (More)

Weegy: When an electric current flows through a long conductor, each free electron moves through a relatively short distance. User: In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the A. cathode. B. grid. C. anode. D. deflecting plate. Weegy: In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the grid. User: A circuit contains two devices that are connected in parallel. If the resistance of one of these devices is 12 ohms and the resistance of the other device is 4 ohms, the total resistance of the two devices is A. 0.333 ohms. B. 3 ohms. C. 16 ohms. D. 0.0625 ohms. (More)