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Stack #4675160

Exploration Education Section 8 Light Study Guide

QuestionAnswer
Reflector A surface that bounces light or sound waves back instead of absorbing them.
Lens A curved piece of glass or plastic that bends (refracts) light to form images.
Frequency The number of wave cycles that pass a point per second (measured in Hertz, Hz). Determines pitch in sound and color in light.
Prism A transparent object that refracts light and separates it into its component colors (spectrum).
Light Year The distance light travels in one year (used to measure vast distances in space).
Joule The standard unit of energy in physics.
Ultraviolet A type of electromagnetic radiation with a frequency higher than visible light (not visible to the human eye).
Vacuum A space with no matter; light can travel through it, but sound cannot.
Penumbra The partially shaded outer region of a shadow.
Sources Objects or places where light or sound originates (like the sun or a speaker).
Photoelectric Related to the emission of electrons when light shines on a material (photoelectric effect).
Corona The outer atmosphere of the sun, visible during a solar eclipse.
Photon A particle of light that carries energy.
Refraction The bending of light as it passes from one medium to another.
Sundial A device that tells time by the position of a shadow created by the sun.
Convex A shape (like a lens or mirror) that curves outward and spreads light rays.
Transparent A material that allows light to pass through clearly.
Photosphere The visible surface of the sun that emits light.
Opaque A material that does not allow light to pass through.
Scatters When light or sound waves spread out in different directions after hitting particles or surfaces.
Amplitude The height of a wave; determines loudness in sound and brightness in light.
Concave A shape that curves inward and can focus light or sound waves.
Radiant Energy that travels in the form of electromagnetic waves (like light or heat).
Calorie A unit of energy (often used for heat energy).
Laser A device that produces a focused beam of light with a single wavelength.
Energy The ability to do work or cause change.
Umbra The darkest, fully shaded part of a shadow.
Atom The smallest unit of matter, made of protons, neutrons, and electrons.
Infrared Electromagnetic radiation with longer wavelengths than visible light; often felt as heat.
Thermal Energy The energy related to the motion of particles; perceived as heat.
Light year The distance light travels in one year is called a
Sources The sun, a light bulb, and a fire are all light
Vacuum A light wave can travel through a
Photons Light particles that allow photoelectric (solar) panels to work are called
Scatters As light travels from its source, it
Penumbra Shadows can be classified as umbra and
Transparent An object that you can see through is considered
Opaque An object that you cannot see any light through is
Reflector A mirror is considered a
Prism A clear glass or plastic triangle that separates light into all its colors is called a
Ultraviolet Three classifications of light are visible, infrared, and
Laser A device that produces a single-sized light wave that does not scatter easily is called a
Photosphere The layer of the sun that makes light is called
Thermal energy What is the scientific name for heat energy?
Calorie What is the unit of measurement called that equals the heat energy needed to raise one gram of water one degree Celsius?
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