Phenomena which involve the spreading out (diffracting) and the interfering of light are explained using this theory of light.
What is a wave theory?
100
When you can see clear images through this type of material as it transmits most of the light it receives, it is this.
What is transparent?
100
As matter is heated, the molecules move faster, and intermolecular collisions cause the electrons to change orbit. The light emitted when they return to their ground state is called this.
What is incandescence?
100
When chemiluminescence occurs in a life form, such as a firefly or deep sea marine life, it is called this.
What is bioluminescence?
100
This is another name for a small source of light.
What is a point source?
200
In most cases, light will travel in straight lines. When we are able to describe a light phenomenon using straight line motion, we are using this.
What are Ray Optics?
200
When materials transmit no light, they are this.
What is opaque?
200
Sometimes, after an atom has been "excited", the electrons will not immediately return to their lower levels. As such there is a time delay between the energy in and the light out, called this.
What is phosphorescence?
200
When certain crystals are compressed and/or crushed, the mechanical energy may pump electrons up to higher levels. The returning electrons are said to give off this type of light.
What is triboluminescence?
200
A large source of light will produce a shadow with two regions, a darker and lighter section, respectively referred to as these.
What is an umbra and a penumbra?
300
A name for the phenomena involving discrete energy changes in light, other than the quantum theory of light.
What is the particle theory of light?
300
When you cannot see completely clear images through these materials, they are this.
What is translucent?
300
Sometimes chemical energy is converted directly into light energy, instead of heat as is the norm with most exothermic chemical reactions. This is called ...
What is chemiluminescence?
300
In a recently discovered method of producing light, sound waves are used as the input energy. The output is called this.
What is sonoluminescence?
300
The production of shadows is strong evidence for the fact that light travels in straight lines, usually referred to as this.
What is linear propagation?
400
An atom may absorb light energy and its electrons pumped up to a higher level. If it is a reasonably high level, the electron may come down in stages, rather than in one jump. High energy absorbed light (eg. ultraviolet) may return as two or more lower energy lights. When light is emitted in this fashion it is called this.