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Don't ask questions if you don't want an answer

Simply put, because they don't have mass. 

Quote from: sokarul on March 26, 2008, 09:04:10 AM

Don't ask questions if you don't want an answer

I do want an answer, that is why I'm asking the question...

So, stop avoiding and answer it, please.

Quote from: Acarus_siro on March 26, 2008, 03:44:52 AM

Simply put, because they don't have mass. 

Sorry, but that is incorrect.  Why are you excluding things without mass?

I gave you an answer. 

I'm not excluding anything, the question was asked why photons don't generate gravity and its because they don't have mass

As a supplementary I addressed a common misconception with this in that people often don't understand how photons can't have mass yet are deflected by the gravitational field of massive objects...

You accept that photons don't have mass? 

Sorry guys, I'm a physicist.

I can see how you've gotten confused by this, yes, a photon has energy and E=mc^2 can give you an equivalent mass, but the photon does not have this mass,  the photon always travels at the speed of light, and its mass is always zero.

If you were on a bus going at the speed of light and you shone a torch out of the front window the photons would from your point of view move away at the speed of light.  This is special relativity.

The photon does have momentum, though it does not have mass ever.

Sorry guys, I'm a physicist.

I can see how you've gotten confused by this, yes, a photon has energy and E=mc^2 can give you an equivalent mass, but the photon does not have this mass,  the photon always travels at the speed of light, and its mass is always zero.

If you were on a bus going at the speed of light and you shone a torch out of the front window the photons would from your point of view move away at the speed of light.  This is special relativity.

The photon does have momentum, though it does not have mass ever.

http://en.wikipedia.org/wiki/Special_relativity

Sorry guys, I'm a physicist.

I can see how you've gotten confused by this, yes, a photon has energy and E=mc^2 can give you an equivalent mass, but the photon does not have this mass,  the photon always travels at the speed of light, and its mass is always zero.

If you were on a bus going at the speed of light and you shone a torch out of the front window the photons would from your point of view move away at the speed of light.  This is special relativity.

The photon does have momentum, though it does not have mass ever.

http://en.wikipedia.org/wiki/Special_relativity

I'm not sure I believe in photons though tbh, I've never actually seen one...

All of my above post concerned just special relativity and is correct.   I have taken courses in both relativities...  as part of my masters degree in Astrophysics from one of the most respected universities and research institutions in the world (I had the name there but deleted it, believe it/don't believe it).

I'm not sure I believe in photons though tbh, I've never actually seen one...

Quote from: sokarul on March 26, 2008, 09:29:11 AM

I gave you an answer. 

Right, but it did not answer the question.

Now, please do so.

Quote from: TheEngineer on March 26, 2008, 09:58:06 AM

Quote from: sokarul on March 26, 2008, 09:29:11 AM

I gave you an answer. 

Right, but it did not answer the question.

Now, please do so.

I answered the question, what part don't you understand?


Photons have no mass rest or other. 

Quote from: sokarul on March 26, 2008, 01:46:20 PM

Quote from: TheEngineer on March 26, 2008, 09:58:06 AM

Quote from: sokarul on March 26, 2008, 09:29:11 AM

I gave you an answer. 

Right, but it did not answer the question.

Now, please do so.

I answered the question, what part don't you understand?


Photons have no mass rest or other. 

They have a relativistic mass...

Even a photon, a particle which moves at the speed of light, has relativistic mass.

All of my above post concerned just special relativity and is correct.   I have taken courses in both relativities...  as part of my masters degree in Astrophysics from one of the most respected universities and research institutions in the world (I had the name there but deleted it, believe it/don't believe it).

I'm not sure I believe in photons though tbh, I've never actually seen one...
I'm not convinced by STM images either really...  all they show is charge distribution rather than actual atoms, I think the whole atoms thing is just rubbish the universe is just made of weird lumps of charge...
And rain? I was walking outside in the rain today and came in completely dry, I refuse to confirm the validity of crackpot 'rain is wet' theories...

I'm re-deleting my account now, just felt I had to make that point.

I won't read this again, so don't reply to it.

Quote from: Wikipedia

Even a photon, a particle which moves at the speed of light, has relativistic mass.

Read: http://en.wikipedia.org/wiki/Mass_in_special_relativity

According to Lev Okun,[1] Einstein himself always meant the invariant mass when he wrote "m" in his equations, and never used an unqualified "m" symbol for any other kind of mass. Okun and followers reject the concept of relativistic mass. Arnold B. Arons has argued against teaching the concept of relativistic mass:[16]

I'm re-deleting my account now, just felt I had to make that point. As I have suggested elsewhere, question why you feel so threatened and you'll move to having a happier life.

Quote from: Acarus_siro on March 26, 2008, 01:01:41 PM

I'm re-deleting my account now, just felt I had to make that point. As I have suggested elsewhere, question why you feel so threatened and you'll move to having a happier life.

I love it when a noob gets his E-degree thrown in his face and so hi gets all, "Fine, I don't care if you believe me, I'm leaving, and I won't come back!"

It just brightens my day.

I answered the question, what part don't you understand?

Quote from: sokarul on March 26, 2008, 01:46:20 PM

I answered the question, what part don't you understand?

The part where you explained why photons don't have a gravitational field. 


Oh, wait, I didn't understand it because you haven't posted it yet.

Don't ask questions if you don't want an answer.

I do want an answer, that is why I'm asking the question...

I already answered it.