Light Flashcards
Light
Electromagnetic radiation within a very small portion of the electromagnetic spectrum. It is in the visible spectrum, and referred to as visible light.
Beam
A ray of light.
Ray
A straight line of light (and heat) that comes from the Sun/luminous body, or passing though a small opening.
Energy
The property that must be transferred to an object in order to make heat or energy.
Luminous
A body that produces its own light (E.g. the Sun).
Non-Luminous
A body that reflects the light from luminous bodies (E.g. the Moon).
Speed of light
Approximately 300000km/s.
Shadow
A dark area, from a light source, that is covered by an opaque object
Electromagnetic Spectrum
Complete range of wavelengths radiated as electric and magnetic fields.
Radio Waves
Low energy electromagnetic waves with a much lower frequency and longer wavelength than visible light.
Infra-red Rediation
Invisible radiation emitted by all warm objects, commonly known as heat.
Ultraviolet Radiation
Invisible light that contains Vitamin D, however too much exposure to it can cause sunburn.
X-Rays
High-energy electromagnetic waves that can be transmitted through solids and provide information about their structure.
Gamma rays
High-energy electromagnetic radiation produced during nuclear reactions. They have no mass and travel at the speed of light.
Reflection
Bouncing off the surface of a substance.
