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A disturbance that transfers energy through space and matter without needing a physical medium.
What is an electromagnetic wave?
The distance between one point on a wave and the identical point on the next wave.
What is wavelength?
The number of waves that pass a fixed point in one second, measured in Hertz.
What is frequence?
The height of a wave from its resting position to the top of a crest (or bottom of a trough).
What is amplitude?
A form of radiant energy that travels in straight lines as waves and allows the human eye to see.
What is light energy?
Any object that produces its own light.
What is a light source?
A straight line used to represent the path of a light wave.
What is a ray?
A dark area created when an opaque object blocks light from passing through?
What is a shadow?
Materials that allow light to pass straight through clearly.
What is transparent?
Materials that allow some light to pass through but scatter it, causing images to look blurry.
What is translucent?
Materials that block all light from passing through, they either absorb or reflect the light.
What is opaque?
The bouncing back of light waves when they strike a smooth, shiny surface, like a mirror.
What is a reflection?
The bending of light as it passes from one material to another, causing light to change speed.
What is refraction?
The process by which light energy is "soaked in" to matter and often converted into heat energy.
What is absorption?
The passing of light energy through matter.
What is transmission?
The spreading out of light waves in all directions, which is what causes the sky to appear blue.
What is scattering?
A clear glass or plastic object used to separate white light into its component colors.
What is a prism?
The band of colors produced when white light passes through a prism.
What is spectrum?
The following are examples of what . . . clear glass, clean water.
What is transparent?
The following are examples of what . . . frosted glass, wax paper.
What is translucent?
The following are examples of what . . . wood, metal.
What is opaque?
The part of the electromagnetic spectrum that we see.
What is the visible light?
All electromagnetic waves travel at the same speed.
What is the speed of light?
The incident ray is equal to the . . .
What is the reflected ray?
An instrument that can view object from concealed positions.
What is a periscope?