Originally posted by jeep3r
Originally posted by HumbleHelper
I'm certain that light is just motion. Change. Time.
I'm not a scientist, but I found this thread interesting and have an own idea about that question:
Could it be that light is matter in motion or mass in motion (at the speed of light). When thinking about relativity, isn't it so that - theoretically
- the mass of an object moving at the speed of light is indefinite? So it actually 'becomes' light itself. If so, wouldn't it perhaps be possible to
reverse the process and extract certain amounts of mass from light by slowing it down in some way (don't ask me how, though)?
It's just a thought. If you think this is total nonsense, please feel free to ignore this post ...
Its thought that light is massless, because it is the quantity of energy that can travel with the highest velocity, a constant, the speed of light.
Because E=mc^2 .... the energy of light, can be used to push a solar sail and make a space ship with one travel very high speeds. Because the sun
emits a lot of light. This light has velocity and momentum, which it imparts as a force on whatever it comes in contact with. So traveling through a
vacuum, light is massless, its not affected by gravity like a bowling ball is ( it is thought to be affected by gravity for another reason) but once
the massless light touches something like a leaf of a tree it imparts its velocity and frequency, its energy content onto the atoms of that leaf,
which the leaf can then qucikly use this EM vibration to store in its mechanisms to use for chemical energy (photosynthesis).
you say light is thought to be matter in motion. The word matter is a little weird, so im not sure, I have a lot of questions about this subject my
self, and the words are weird... Because I suppose someone would say light is not matter it is energy. An atom is matter, and it has a total mass
from its components, but an atom moving can be considered energy. I think maybe light is considered to be massless because it doesnt exist, or is not
known as to where it exists in its rest state, maybe being a phenomenon only of velocity and momentum and interaction, that only exists in certain
circumstances. Im not sure. So 5 atoms at absolute zero arent moving,and there for arent emitting light, there is matter there, but not kinetic
energy. once we allow the temperature to rise a little (motion between atoms) this is more energy, now they are emitting this light energy and thermal
radiation, and it is the same quantity of matter, just in a different circumstance in which they are able to interact in a way as to produce this
massless energy we know as light or EM radiation.
You can look for experiments, I think scientists have slowed down light. light can also be slowed through certain mediums, because its said the speed
of light is constant in a vacuum. So if we use anything other then a vacuum to slow the light down, we are slowing it down by having the energy
interact with atoms, which would be minimizing the quantity of light over a time, which is equal to say the quantity of light that went in our
experiment and medium to attempt to slow down is losing energy. and it is transferring its energy to the atoms, im pretty sure this occurs via
electron excitation. and so those atoms that receive energy from the light perhaps are momentarily more massive, im not sure exactly.. because I dont
know how long atoms which receive light , i dont know how long their electrons get excited, or if there is an extra electron. if the electron "jumps
to a higher energy state" without increasing the quantity of electrons in an atom, im not sure if this is still increasing the mass of the atom, but
it might be able to be looked at this way, because if the electron jumps to a higher energy state when it is excited with light, then I wonder if that
truly means that the atoms total potential energy increases.. and if that is true that an atom has this potential energy... a light quantity hits the
atom... now that atom has this higher amount of energy... the higher energy atom because of mass energy equivalence could, I think be said to be more
massive. thus you would have turned light into mass, or matter..
edit on 15-2-2013 by ImaFungi because: (no reason given)