What is light, and how does light originates?

Question

!!! no funnies please !!!

Answer 1

The energy sensed by our eye is light.

All objects send this sensible energy to our eye.

We ‘see’ those objects.

Objects which are emitting this light energy are called luminous objects; and those which simply receive the energy from these luminous objects and send them in all directions are called non-luminous objects.

The luminous objects emit (light) energy, because the electrons in the atoms which are to be in their normal state are now in excited state having high energy.

As they do return to their normal state, they emit the excess energy as light out side.

The emitted energy is in the form of electro-magnetic radiation.

The energy is transmitted even in vacuum with a speed of 3x10^8m/s.

The different frequency of the transmitted wave produces different sensation in our eye, by which we distinguish the color.

An ordinary iron piece is not emitting light at room temperature. It is a non luminous object.

If the temperature is raised to about 600degre centigrade, it becomes a luminous object and emits light which our eye senses it as red color.

The heat energy given to iron rod are taken by electrons of the atoms of iron and electrons emit these energy in certain conditions as light.

Answer 2

It's not an easy question. Light is one of those root things that doesn't decompose into simpler concepts. For instance, light isn't 'made up' of anything other than light.

You can view light in different ways, as a packet of energy smeared over space; as a localized amount of energy, a photon; as a massless change in the electromagnetic spectrum that always moves at light speed regardless of observer motion.

To say that we understand light is a bit of a stretch. We know a lot about it, how to measure it, how to manipulate it and so on. But it's a fundamental thing, like gravity. It's better to say we appreciate it rather than understand it.

For instance, why is light speed the number it is? How is it that light can be entangled as far as polarity goes?

Answer 3

Light is electromagnetic radiation within the visible range of wavelengths. EM radiation results from the electric and magnetic fields produced by changes in the motion of charged particles (current). For visible light, the frequency of such changes is high enough that the electronic motion responsible is usually due to discrete changes in the orbits of electrons bound to atoms. At that small scale, a classical description fails and quantum mechanics is needed to describe the transitions quantitatively.

Answer 4

Light is simply a name for a range of electromagnetic radiation that can be detected by the human eye.The form of radiant energy that stimulates the organs of sight, having for normal human vision wavelengths ranging from about 3900 to 7700 ångstroms and traveling at a speed of about 186,300 miles per second.

One ångstrom = 10-8 cm (0.00000001 cm).


The light originates at the monochromatic light source.

Answer 5

Light is both a wave and a particle. In particle form, it is known as a photon with a certain frequency and wavelenght. Photons are created in many chemical reactions, particularly those in the sun.