posted on Jan, 10 2003 @ 08:14 AM
Everything propagates like a wave and exchanges energy like a particle .
A photon obeys the particle-wave duality ,so it can be assumed to as a wave and a particle at the same time !
Light is made up from massless particles called photons .
But photons and light can be expressed as waves .Light is part of our electromagmetic spectrum ,therefore photons are electromagnetic radiation .
The other parts apart from the visible part of spectrum are:Ultra-violet,infa red, microwaves ,X-rays radio waves,gamma rays.
The energy is coming to us in the form of packets or quanta therefore is said to be quantised !
I will give you the reason for that.The energy
E=n^2 p^2 h^2/2mL^2.This is the formula for the energy.
As you can see h is just the Planck's constant,p is the greek pi or 3.14 (another constant), m is the mass of any given particle ,L is the region
that it is confined.But n depends on the energy level that the particle is .For example for n=1 then n^2=1 ,but for n=2 then n^2=4 .Therefore because
of the term n^2 we cannot have values like n^2=3 , why is that??Because simply
n=1,2,3,4.... Only integers....