Here is a question.. Does light have mass. If so how much?

Question

Cause if light never had mass then the whole theory of science related to light would be wrong . That is even in Enstine E=Mass of the light X Velocity . Here i would like to know the mass of light

Answer 1

The mass that is used in the theory of relativity is rest mass.
Light has zero rest mass.
(light is never at rest is any reference frame)
Light has a mass equivalent in E=mc^2

Answer 2

Is there emperical evidence that light and mass may be "one and the same"? There is.

When a high frequency photon approaches the center of an atom, it is able to form negative and positive electrons. The positive one is antimatter, so it immediately, upon meeting with another electron, disappears back into radiation (photon).

What forms high frequency photons into electron mass, is that the frequency is made to complete a rotation of more than 360 degrees. In doing this part of its frequency bonds to itself (like a long door spring bonds to itself if twisted in a circle and one end is pushed inside the other). When this act is done, mass forms in one-half the area below the electric equator and magnetic lines forms in the other half. Mass and magnetism have an eqivalence in an electron.

The last thought is, the energy of the photon determines the mass potential of it. Radio waves through visible light could never form into an electron because they have too little energy. There are cosmic frequencies, of themselves, that would appear to act as a mass.

Answer 3

All energy enters into the gravitational equations as an equivalent mass. So light does have a mass in this sense. It also has a momentum. However, it does not have a *rest mass*. The full equation relating mass, energy, and momentum is
E^2 =m^2 c^4 +p^2 c^2
where E is the energy, m is the rest mass, and p is the momentum. For light, m=0, so
E=pc.

Answer 4

Funny but I always thought photons were massless quanta of electromagnetic radiation. i.e. light is energy not matter even though energy and matter are related and interchangeable as shown by the famous equation E=m*c^2. And, light bends around bodies because those bodies like stars warp space. So, light travels in a straight line through curved space-time-and relative to certain observers, the path the photon took appears to have been bent.
So, no, photons of light do not have mass. As anything approaches the speed of light, it gains mass, needing more energy to propel it faster, faster causing it to gain more mass, needing yet more energy...in the end, if you were to move something at the speed of light, it would have infinite mass and wold have needed an infinite amount of energy to get to that speed. So, only something that is massless can travel at the speed of light.
You interpreted the equation incorrectly. The m refers to some particle of matter, not a quanta of electromagnetic radiation, which is what light is.

Answer 5

E=Mc^2 according to Einstein. How ever much energy it has just solve for that mass value in the equation.

Answer 6

like electrons having duel nature,light too does have a duel nature ie;with and without mass .think of the relation between photons and electrons

Answer 7

The energy of a light photon is hf
h= Planck's constant and f = frequence
(Read: photo electric effect)

The energy is also mc2
c = speed of light.
(Einstein's relativity)

Combine: mc2=hf or m = hf/c2

Answer 8

Light must have mass because you can bend it by gravity and black holes will consume it.

Answer 9

The answer is that it depends. Here is an excellent article on the topic:

http://math.ucr.edu/home/baez/physics/Relativity/SR/light_mass.html

Answer 10

yes, it has . as u have reffered to theory of relativity let me tell u that it dpends upon the observer and it's frame of reference that matters.