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"

All Waves Transfer Energy Fact

All waves (including sound waves, electromagnetic waves, and even water waves) transfer energy, and all energy is transferred in a wave-like motion.

At Its Core, Chemistry is Physics Fact

On a fundamental level, chemistry can be explained by physics. The atoms that make up the periodic table elements are themselves made of quantum particles.

Sound Always Travels Slower than Light Myth

Sound usually travels slower than light, but not always. Under normal conditions, light moves roughly a million times faster than sound, but under the right conditions sound can travel faster than light.

Human Behavior can be Random Fact

Human behavior can be random to some extent, but most behavior is based on prior input, and thus is “deterministic” (meaning not totally random).

Reading in Dim Light is Bad For Your Eyes Myth

Reading in dim light isn’t bad for your eyes. Be it a book or electronic device, reading in dim light will not damage the eyesight of a healthy adult (although it may cause temporary strain).

Light is Both a Particle and a Wave Fact

Light is a particle (a photon), that acts like a wave (“both a particle and a wave”), which can be measured as an excited quantized state of the electromagnetic field.

LED is a New Technology Myth

The first light-emitting diode (LED) was created in 1927, but LED technology wasn’t mass-marketed or mass-produced until the 1990’s.

Edison Never Invented Anything Myth

Thomas Edison was a businessman, ideas-man, inventor, and more. He invented things, but more-so he collected patents, headed a team of developers, and created companies.

Light Can Affect Mood Fact

Exposure to light in moderation, especially natural sunlight, can have an uplifting effect on mood, while excessive darkness can have the opposite effect.

Time is Relative Fact

Time is relative to speed and gravity (time dilation), and so is space (length contraction). Light speed is constant for all observers, so time and space can’t be.

Blog Posts tagged with "Light"

What is Light?

“Light” is a particle (photon), that acts like a wave, and is understood as a localized vibration in the electromagnetic field.