How do we know plants need energy provided by light?
Amplitude: The maximum height or depth of a wave away from its resting position.
Crest: The maximum upward point of a wave away from its resting position.
Diffraction Grating: A material with a series of thin lines used to refract light that passes through it.
Electromagnetic Spectrum: All forms of light, visible and invisible, arranged according to wavelength. All electromagnetic waves travel at the speed of light, but they do it at a wide range of frequencies, wavelengths, and photon energies.
Illuminate: The action of brightening an object with light.
Infrared: A type of light that is invisible to human eyes but can be felt as heat. It is below red visible light on the electromagnetic spectrum.
Laser: A device that stimulates atoms to release a narrow focused beam of light. Laser is an acronym for “light amplification by the stimulated emission of radiation.”
Light: electromagnetic radiation of any wavelength, whether visible or not, though usually referring to visible light. Light is made up of photons.
Light Intensity: In agriculture, how much light a plant receives.
Light Quality: In agriculture, the type of light a plant receives.
Photon: a particle of light. Photons have been observed to travel as both, waves and particle.
Photoperiod: In agriculture, the amount of time a plant receives light.
Reflection: The change of direction of light caused by bouncing off a material.
Refraction: The change of direction of light caused by its path moving from one material into another.
ROYGBIV: All of the colors in the visible light band of the electromagnetic spectrum. ROYGBIV stands for Red, Orange, Yellow, Green, Blue, Indigo, Violet.
Trough: The maximum downward point of a wave away from its resting position.
Ultraviolet: A type of light that is invisible to human eyes. Ultraviolet is beyond violet on the electromagnetic spectrum.
Wavelength: The distance between two identical points on consecutive waves.