Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum, photons are the carrier particle for electromagnetic energy.
Light speed is the max speed of the universe. All massless energy particles (of which the universe is largely made of), including photons, always travel at light speed in a vacuum (they have momentum, not mass).
Light is a particle and a wave that exists as an excited state in the electromagnetic field that permeates the universe (according to quantum field theory).
Light can affect mood, our skin can synthesize vitamin D from light, plants can turn light into energy like we do with food, light can be used to store information instead of electrons in quantum computers, Li-Fi is Wi-Fi that uses light, Light can be used as solar energy, the list goes on.
Light is one of the strangest and most fundamental aspects of the universe, and accounts for one of four fundamental forces. Visible light is just a small frequency range in the electromagnetic spectrum.
To understand the nature of light is to understand the nature of the physical universe.
Factoids tagged with "Light"
In theory, the speed of light, in a perfect vacuum, measured from an inertial frame, is constant with an exact value of 299,792,458 m/s.
All elementary particles exhibit wave-particle duality, acting as both a particle and a wave.
According to physics, if a tree falls and no one is around to hear it, it still makes a sound. Sound is a mechanical wave of pressure and displacement through a medium such as air or water. We don’t have to perceive a sound to know the laws of physics are in play.
Planck units, based on the reduced Planck constant (ℏ) and Planck constant (h), represent the smallest measurable units in the physical universe.
The standard model of particle physics shows how the elementary particles interact via the four forces to create the physical universe.
Competitive sports became popular in the United States from 1850 – 1950 because of lighting technology, mass media, and developing labor and education laws.
Blog Posts tagged with "Light"
We explain “light,” both as electromagnetic radiation within a visible portion of the electromagnetic spectrum, and as electromagnetic energy carried by photons.
There are two types of waves: mechanical waves like sound that must travel through a medium like air, and electromagnetic waves like light that don’t.
We explain the standard model of particle physics in simple terms for non-experts using videos, facts, and bullet points.