Chapter 7 Physics – Flashcards
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A full moon is more luminous than a half moon.
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False
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An incandescent object is luminous because it has a high temperature.
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True
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As the temperature of an object increases, the greatest amount of radiation emitted shifts toward shorter wavelengths.
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True
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A rainbow is formed when refraction of light in raindrops disperses it into its spectrum colors, with red light refracted the most and violet the least.
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False
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The sky appears blue due to the light reflected from the oceans.
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False
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A virtual image is
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Your brain's interpretations of light rays
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As the angle of an incident ray of light on a water surface increases, the angle of the refracted ray
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Also increases
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When viewed straight down (90° to the surface), an incident light ray moving from the water to air is refracted
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Not at all
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Light with the lowest frequency (longest wavelength) detected by your eyes is perceived as
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Red
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The index of refraction is based on the ratio of the speed of light in
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A vacuum to the speed of light in the transparent material.
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A mirage is produced because
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Warm air has a higher index of refraction than cool air.
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The shimmering that is observed over a hot surface is
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Changing refraction from the mixing of warm and cool air.
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According to the relationship between frequency and energy of light (E = hf), which color of light has more energy?
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Blue
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Which of the following cannot be explained with a wave theory of light?
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Photoelectric effect.
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Which of the following cannot be explained with a particle theory of light?
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Polarization
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Reflection
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occurred on a smooth surface, such as a mirror
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Refraction
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this change of direction of a light ray at the boundary.
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Properties of Reflection
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The angle of the light ray to the surface and the nature of the material determine if the light is absorbed, transmitted through a transparent material or reflected.
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Properties of Refraction
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When light moves from one transparent material to another transparent material with a slower speed of light, the ray is refracted toward the normal.
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Ray Diagrams
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Rays reflected from a perfectly smooth surface are parallel to one another. Diffuse reflection from a rough surface causes rays to travel in many random directions.
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Incandescent
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when visible light is given off as a result of high temperatures.
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Luminous
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the kinds of light that is produce naturally. Example is a sun.
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Black-body Radiation
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refers to an idealized material that perfectly absorbs and perfectly emits electromagnetic radiation.
