If light has no mas then way does E=mc²?

Question

Remember m = mass
and E being energy which is light or photons

Answer 1

Sorry u are wrong. the E is the energy that would be generated from the mass . There is no photons mentioned .

Answer 2

Hello,

Okay, the formula E=mc^2 maybe a little misleading if you don't realize that the c is defined as the speed of light. Photons don't have a mass because it is the fastest traveling thing in the universe (besides information) and the point is that anything that does have mass if it travels as fast as light will be converted into energy. All the equation really says is that Mass can be converted to Energy (but it's really hard to do the converse -- but it is possible).

The particle/ wave "duality" seen in some experiments is kinda misleading as well. If you look at light in some experiments it looks as if it behaves as a wave (i.e. interfence patterns) but if you look at light in other experiments it behaves as a particle (the double-slit experiments) the truth is that we don't have the foggiest reason as to why light behaves the way it does...

Anyway, Energy is not a photon, a photon is an object with a certain speed. This object travelling very fast when it hits another object will transfer its energy (speed) to the object it hits. Most of the time electrons pop out, but it can be a lot of other elementary particles, it just depends on what you're using and how small it is...

If you're interested in relativity read the source Einstein's Relativity...it's a fast and understandable read. A couple of equations, but not too hairy as to make you regret buying the book.

Good Luck,
rlj

Answer 3

> Remember m = mass
Right.
> and E being energy
Right.
> which is light or photons
Not so right. Photons represent one kind of energy, but there are many others; and the equation E=mc^2 has nothing in particular to do with photons. It states that, for things which DO have mass, that mass is equivalent to an energy of mc^2. See this link for an interesting discussion: http://205.243.100.155/photos/shrinker5.pdf

Answer 4

Somebody (asker or answerers) is missing the point somewhere along the line.
E = mc^2 is explicitly only to show the mass-energy relationship.
A body of mass m is the same in a relativity framework as mc^2 of energy as photons.
Photon(s) of energy E can be converted to the equivalent mass E/c^2.
It says given a mass m, the energy associated with the mass, and only the mass, is mc^2 (in the same way we have energy associated with translational kinetic energy for example 0.5mv^2, but this just seems odd to have energy related to mass as in ordinary experience never the 'twain shall meet...)

Answer 5

I think you are a little confused. In the equation E=mc² E is energy. m is mass. And c is the constant of the speed of light. That number is huge (186,000 miles per second) and when squared even larger so if you take even a small mass and multiply it times that huge number you get a lot of energy.

It has nothing to do with the mass of a photon (a particle of light), but of the speed of light which is a constant 186,000 miles per second.

Answer 6

Einstein was just trying to say that mass can be converted into energy, and vice versa. hence the atomic bomb. light is a particle and a wave, so yes it does have mass. that is almost redundant.

Answer 7

Nuclear. Cheat in Age of Empires.

Answer 8

Photons have no *rest* mass, i.e. no inertia.

They gravitate as if they had mass E/c^2.

Answer 9

well nothing really has mass
the mass in an atom is intangible
many just translate an atoms existance as material, something solid, so that's the way they are experienced
that's my take on it

Answer 10

This is wave/particle duality.