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# Does light have Mass?

peter jeffrey cobb

1
Sun 24 Apr, 2011 02:52 am
@peter jeffrey cobb,
like I said I do not carry much of a formal education. But energy carry mass right? And doesnt a light ray some particle of it not sure what carry energy? Am I missing something here?
0 Replies

BillRM

2
Sun 24 Apr, 2011 04:14 am
@peter jeffrey cobb,
Quote:
Ok then does the light wave' carry energy? Does energy have mass?

Yes to both as in energy=mass*C(light VEL)^2

OmSigDAVID

1
Sun 24 Apr, 2011 04:33 am
@BillRM,
Thanx for the video.

An e z comparison is that water and ice r the same thing.

David
0 Replies

rosborne979

1
Sun 24 Apr, 2011 07:04 pm
@BillRM,
BillRM wrote:

Quote:
Nothing that moves at the speed of light can have mass, and nothing that has mass can move at the speed of light.

Nothing that moves at the speed of light can have rest mass, and nothing that has rest mass can move at the speed of light.

Agreed.

I was trying to keep the answer simple to understand.
peter jeffrey cobb

1
Mon 25 Apr, 2011 09:00 am
@rosborne979,
Ok can you dumb it down for me a little. Im still having a hard time understanding. If a light ray or what ever the scientific name for is. Carries energy. And by the Proffessors defenition of E=MC2. Is basicaly that Energy and Mass can be transformed back and forth from energy to mass and vice versa. So what I am understanding is that basicly energy is just another state of matter for of mass. Like 'solids. liquids. gases. plasma. Energy. So I am going by that asuption that something that carries Energy must therefore carry Mass. Now I am not well educated. I have a hard time reading. So Guess my question is. How could ligh rays not carry Mass unless they somehow do not carry Energy?
BillRM

2
Mon 25 Apr, 2011 09:20 am
@peter jeffrey cobb,
At this point I am not sure what your problem happen to be light waves/photons carry mass by reason of their energy of motion.

Light waves/photons have no mass at rest and nothing can go at the speed of light that have rest mass as the rest mass would go to infinite or to say it another way all the energy in the universe could no power any object with a rest mass not zero to light speed.
peter jeffrey cobb

1
Mon 25 Apr, 2011 06:04 pm
@BillRM,
Ok I think I understand. So at rest it means not moving. So as long that it has no motion then it carries no energy and therefore no mass. Am I understanding it right? I have no Idea what you mean by rest mass? that means not moving?
peter jeffrey cobb

1
Mon 25 Apr, 2011 06:40 pm
@peter jeffrey cobb,
Ok from what I understand from what I read for the defenitionn of photons. It is currently believed to be without mass. Although it is emited like radiation from something. Other particles of radiation like alpha particles contain mass. It just seems strange though. The whole argument over it being without mass is that it has a speed limit. But yet it came or it was produced from something that it had mass. It came from something. Not nothing. Hmm kind of like Nothing comes from nothing. How do you even do all these equasions to say how many photons are emited from something. Or how much? Like you say 20 grams of something that emits photons. And then mutiply it by zero. Yall mathamaticians got a hard job I tell ya. But again it says that this is just the current belief, Until proven otherwise. If you extrade a zillion photons from 1 gram of something, Couldnt you reverse the equation? Or can you extract an unlimited amount of photons from something without decaying it? If it has 0 mass then that silly question should make sense. Is not build from mass. Then what is it build from? I couldnt realy narrow it down can yall help clarify that for me please? Thank you.
BillRM

1
Mon 25 Apr, 2011 09:19 pm
@peter jeffrey cobb,
Quote:
rest mass? that means not moving?

yes rest mass mean not moving as in photons have no mass when not moving they had zero rest mass unlike most everyday matter.
0 Replies

BillRM

1
Mon 25 Apr, 2011 09:26 pm
@peter jeffrey cobb,
lord mass and energy is one and the same so anything with mass have energy and anything that carry energy have mass.

Now as far as turning energy back into matter where it came from there is the second law of thermodynamic that is likely to get in the way.

I strongly suggest you go to a public library and check out a college level beginning text book on Physics.

peter jeffrey cobb

1
Tue 26 Apr, 2011 03:16 pm
@BillRM,
I have read 3 books tops my whole life all the way thru. One of them took me over a year and I lost total concept of the story in its entirity. My mind goes and try to make conclusions sentance by sentance. In school either like in math I came up with my own formulas to deciver a problem or i dint. So teachers either gave and A on the tests or an F. I dint any homework even though it counted for 30% of the grade. Yet somehow I was moved along thru grades. I realy think someone was involved in passing me tru school. Eventualy I just went and decided to get my GED. Work same thing. I delegaded paperwork and just signed alot. People knew there was something peculiar about me. Been called crazzy alot. Sometimes I took as compliment like at my job were it required me to climg 10+ storie tall steel. Crazzy meant Good. Other times I felt insulted. But my mind is wondering off the the topic again. Reading books in its enterity are not visible to me. I do want to thank you for trying to help me understand in short manageble answers. Sometimes I feel like I am wearing mind crutches. Hehe thats a funny picture.
BillRM

2
Tue 26 Apr, 2011 03:39 pm
@peter jeffrey cobb,
Ok, Peter I can only hope that I and others on this thread had been somewhat helpful to you.
peter jeffrey cobb

1
Tue 26 Apr, 2011 09:55 pm
@BillRM,
Yes kind of i still dont quite understand 'how' it cant have mass but I think I learned alot so far. Thank you again.
BillRM

1
Wed 27 Apr, 2011 04:55 am
@peter jeffrey cobb,
Peter I am not a physic teacher however the reason nothing can reach the speed of light can have any rest mass is that as you approach light speed the mass increased to the point that all the energy in the universe is not enough to increase it speed further. All the energy at your command is being used to increased the mass of the object not the speed.

Put another way mass is not a constant for an object it depend on it speed.

Even a baseball you had thrown had a very very very very small increase of mass over the ball in your hands.

At everyday speed/velocity this is such a small change that no one can measure it however as your approach a large percents of the speed of light that change in a big way.

Let see the equation is that for any given velocity the mass increase over the rest mass as follow.

Mass (at a given V}=mass(rest)/(1-V^2/C^2)^1/2

The equation is such that at C the velocity of light the rest mass is increased without limit and all the energy you can pump in then in is taken to increased the mass not the speed.
peter jeffrey cobb

1
Thu 28 Apr, 2011 12:02 am
@BillRM,
Makes sense. Thank you. And sorry for being so difficult. Dang skitso mind once it has something in its table it just quetions evreything. One question I stil have is. If a photon has 0 mass then, Whats stopping it from going faster than the speed of light? I mean it should have no friction right?
BillRM

0
Thu 28 Apr, 2011 03:03 am
@peter jeffrey cobb,
Quote:
If a photon has 0 mass then

Zero rest mass not zero mass.
0 Replies

TheEnlightenedOne

1
Thu 28 Apr, 2011 01:19 pm
@peter jeffrey cobb,
Quit being lazy. Go shower, shave, clean the house and get a job. Quit your whining to get sympathy.

peter jeffrey cobb

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Sat 30 Apr, 2011 01:28 am
@TheEnlightenedOne,
Hehe yes tell you what. Ill get you to climb with me at 160 ft of the ground. get in a 6inch rolform steel beam. Teder you to the steel beam bellow you feet. Then ill set there look you in the eyes. And tell you "See this steel structure around you?" I build them for 12 years straight!! Do I look like a lazzy person to you? Care to give it a shot for a year? Lift steel all day? That was my life I loved it! If i could thats were I would Be. Now I am here to find a way to be able to do that. Its what I was breed to do. Now what are your serios questions?
TheEnlightenedOne

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Sat 30 Apr, 2011 06:51 pm
@peter jeffrey cobb,
Enlighten me. You can find a place to participate in discussions like this one, type and compose sentences in English, communicate with countless people over the internet, have two legs and two arms. Please help me understand why you complain about your life situation when you have been so blessed by God?
peter jeffrey cobb

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Sat 30 Apr, 2011 11:44 pm
@TheEnlightenedOne,